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  • 1.
    Absil, Oliver
    et al.
    Université de Liège, Belgium.
    Mawet, Dimitri
    California Institute of Technology/Jet Propulsion Laboratory, USA.
    Karlsson, Mikael
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Carlomagno, Brunella
    Université de Liège, Belgium.
    Christiaens, Valentin
    Universidad de Chile, Chile.
    Defrère, Denis
    Université de Liège, Belgium.
    Delacroix, Christian
    Cornell University, USA.
    Femenía Castellá, Bruno
    W. M. Keck Observatory, USA.
    Forsberg, Pontus
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Girard, Julien
    European Southern Observatory, Chile.
    Gómez González, Carlos A.
    Université de Liège, Belgium.
    Habraken, Serge
    Université de Liège, Belgium.
    Hinz, Philip M.
    University of Arizona, USA.
    Huby, Elsa
    Université de Liège, Belgium.
    Jolivet, Aissa
    Université de Liège, Belgium.
    Matthews, Keith
    California Institute of Technology, USA.
    Milli, Julien
    European Southern Observatory, USA.
    Orban de Xivry, Gilles
    Université de Liège, Belgium.
    Pantin, Eric
    Université Paris Diderot, France.
    Piron, Pierre
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Reggiani, Maddalena
    Université de Liège, Belgium.
    Ruane, Garreth J.
    California Institute of Technology, USA.
    Serabyn, Eugene
    Jet Propulsion Laboratory, USA.
    Surdej, Jean
    Université de Liège, Belgium.
    Tristram, Konrad R. W.
    European Southern Observatory, Chile.
    Vargas Catalan, Ernesto
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Wertz, Olivier
    Université de Liège, Belgium.
    Wizinowich, Peter
    W. M. Keck Observatory, USA.
    Three years of harvest with the vector vortex coronagraph in the thermal infrared2016In: Ground-Based and Airborne Instrumentation for Astronomy VI: 26-30 June 2016, Edinburgh, United Kingdom / [ed] Christopher J Evans, SPIE - International Society for Optical Engineering, 2016, Vol. 9908, 1-14 p., 99080Q-1Conference paper (Refereed)
    Abstract [en]

    For several years, we have been developing vortex phase masks based on sub-wavelength gratings, known as Annular Groove Phase Masks. Etched onto diamond substrates, these AGPMs are currently designed to be used in the thermal infrared (ranging from 3 to 13 μm). Our AGPMs were first installed on VLT/NACO and VLT/VISIR in 2012, followed by LBT/LMIRCam in 2013 and Keck/NIRC2 in 2015. In this paper, we review the development, commissioning, on-sky performance, and early scientific results of these new coronagraphic modes and report on the lessons learned. We conclude with perspectives for future developments and applications.

  • 2. Absil, Olivier
    et al.
    Karlsson, Mikael
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Mawet, Dimitri
    Carlomagno, Brunella
    Christiaens, Valentin
    Delacroix, Christian
    Forsberg, Pontus
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Gomez Gonzales, Carlos
    Habraken, Serge
    Jolivet, Aïssa
    Piron, Pierre
    Van Droogenbroeck, Marc
    Vargas Catalan, Ernesto
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Absil, Pierre-Antoine
    Boccaletti, Anthony
    Baudoz, Pierre
    Defrère, Dennis
    Milli, Julien
    Surdej, Sean
    Optimized, high performance vortex coronagraphs for E-ELT instruments2014Conference paper (Refereed)
  • 3. Absil, Olivier
    et al.
    Karlsson, Mikael
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Mawet, Dimitri
    Carlomagno, Brunella
    Christiaens, Valentin
    Delacroix, Christian
    Forsberg, Pontus
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Gomez Gonzales, Carlos
    Habraken, Serge
    Jolivet, Aïssa
    Piron, Pierre
    Van Droogenbroeck, Marc
    Vargas Catalan, Ernesto
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Absil, Pierre-Antoine
    Boccaletti, Anthony
    Baudoz, Pierre
    Defrère, Dennis
    Milli, Julien
    Surdej, Sean
    Reaching the diffraction limit with the vortex coronagraph2014Conference paper (Refereed)
  • 4. Absil, Olivier
    et al.
    Mawet, Dimitri
    Delacroix, Christian
    Forsberg, Pontus
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Karlsson, Mikael
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Habraken, Serge
    Surdej, Jean
    Absil, Pierre-Antoine
    Carlomagno, Brunella
    Christiaens, Valentin
    Defrere, Denis
    Gonzalez, Carlos Gomez
    Huby, Elsa
    Jolivet, Aissa
    Milli, Julien
    Piron, Pierre
    Catalan, Ernesto Vargas
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Van Droogenbroeck, Marc
    The VORTEX project: first results and perspectives2014In: Adaptive Optics Systems IV, 2014, 91480MConference paper (Refereed)
    Abstract [en]

    Vortex coronagraphs are among the most promising solutions to perform high contrast imaging at small angular separations from bright stars. They feature a very small inner working angle (down to the diffraction limit of the telescope), a clear 360 degree discovery space, have demonstrated very high contrast capabilities, are easy to implement on high-contrast imaging instruments, and have already been extensively tested on the sky. Since 2005, we have been designing, developing and testing an implementation of the charge-2 vector vortex phase mask based on concentric sub-wavelength gratings, referred to as the Annular Groove Phase Mask (AGPM). Science-grade mid-infrared AGPMs were produced in 2012 for the first time, using plasma etching on synthetic diamond substrates. They have been validated on a coronagraphic test bench, showing broadband peak rejection up to 500: 1 in the L band, which translates into a raw contrast of about 6 x 10(-5) at 2 lambda/D. Three of them have now been installed on world-leading diffraction-limited infrared cameras, namely VLT/NACO, VLT/VISIR and LBT/LMIRCam. During the science verification observations with our L-band AGPM on NACO, we observed the beta Pictoris system and obtained unprecedented sensitivity limits to planetary companions down to the diffraction limit (0 : 1 0 0). More recently, we obtained new images of the HR 8799 system at L band during the AGPM first light on LMIRCam. After reviewing these first results obtained with mid-infrared AGPMs, we will discuss the short-and mid-term goals of the on-going VORTEX project, which aims to improve the performance of our vortex phase masks for future applications on second-generation high-contrast imager and on future extremely large telescopes (ELTs). In particular, we will briefly describe our current efforts to improve the manufacturing of mid-infrared AGPMs, to push their operation to shorter wavelengths, and to provide deeper starlight extinction by creating new designs for higher topological charge vortices. Within the VORTEX project, we also plan to develop new image processing techniques tailored to coronagraphic images, and to study some pre- and post-coronagraphic concepts adapted to the vortex coronagraph in order to reduce scattered starlight in the final images.

  • 5. Absil, Olivier
    et al.
    Mawet, Dimitri
    Karlsson, Mikael
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Habraken, Serge
    Surdej, Jean
    Absil, Pierre-Antoine
    Carlomagno, Brunella
    Christiaens, Valentin
    Defrère, Denis
    Forsberg, Pontus
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Girard, Julien
    Gomez Gonzalez, Carlos
    Hinz, Philip
    Huby, Elsa
    Jolivet, Aïssa
    Milli, Julien
    Pantin, Eric
    Ruane, Garreth
    Serabyn, Eugene
    Van Droogenbroeck, Marc
    Vargas Catalan, Ernesto
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Wertz, Olivier
    An update on the VORTEX project2015In: Techniques and Instrumentation for Detection of Exoplanets VII, 2015, Vol. 9605Conference paper (Refereed)
    Abstract [en]

    In this talk, we will review the on-going activities within the VORTEX teamat the University of Liège and Uppsala University. The VORTEX project aimsto design, manufacture, test, and exploit vector vortex phase masks madeof sub-wavelength gratings (aka the Annular Groove Phase Mask, AGPM)for the direct detection and characterization of extrasolar planets. This talkwill specifically report on the commissioning of several AGPMs on infraredcameras equipping 10-m class telescopes, including the VLT, the LBT andthe Keck. We will describe the in-lab and on-sky performance of the AGPMs,and discuss first scientific observations. We will also report on the lessonslearned from the on-sky operation of our vortices, and discuss ways toimprove their performance. The potential of our coronagraphic devices inthe context of future extremely large telescopes and space missions will alsobe addressed.

  • 6.
    Andersson, Per Ola
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences. FOI Swedish Def Res Agcy, CBRN Def & Secur, S-90182 Umea, Sweden.; Mol Fingerprint Sweden AB, Eksatravagen 130, S-75655 Uppsala, Sweden.
    Viberg, Pernilla
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Forsberg, Pontus
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Nikolajeff, Fredrik
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences. Mol Fingerprint Sweden AB, Eksatravagen 130, S-75655 Uppsala, Sweden.
    Österlund, Lars
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics. Mol Fingerprint Sweden AB, Eksatravagen 130, S-75655 Uppsala, Sweden.
    Karlsson, Mikael
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences. Mol Fingerprint Sweden AB, Eksatravagen 130, S-75655 Uppsala, Sweden.
    Nanocrystalline diamond sensor targeted for selective CRP detection: An ATR-FTIR spectroscopy study2016In: Analytical and Bioanalytical Chemistry, ISSN 1618-2642, E-ISSN 1618-2650, Vol. 408, no 14, 3675-3680 p.Article in journal (Refereed)
    Abstract [en]

    Protein immobilization on functionalized fluorine- terminated nanocrystalline (NCD) films was studied by attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy using an immobilization protocol developed to specifically bind C-reactive protein (CRP). Using an ATR- FTIR spectroscopy method employing a force-controlled anvil-type configuration, three critical steps of the ex situ CRP immobilization were analyzed. First, the NCD surface was passivated by deposition of a copolymer layer consisting of polyethylene oxide and polypropylene oxide. Second, a synthetic modified polypeptide binder with high affinity to CRP was covalently attached to the polymeric film. Third, CRP dissolved in aqueous buffer in concentrations of 10–20 μg/ mL was added on the functionalized NCD surface. Both the amide I and II bands, due to the polypeptide binder and CRP, were clearly observed in ATR-FTIR spectra. CRP amide I bands were extracted from difference spectra and yielded bands that agreed well with the reported amide I band of free (non-bonded) CRP in solution. Thus, our results show that CRP retains its secondary structure when it is attached to the polypeptide binders. Compared to previous IR studies of CRP in solution, about 200 times lower concentration was applied in the present study. 

  • 7.
    Carlomagno, Brunella
    et al.
    Université de Liège, Belgium.
    Absil, Olivier
    Université de Liège, Belgium.
    Kenworthy, Matthew
    Leiden University, The Netherlands.
    Ruane, Garreth
    California Institute of Technology, USA.
    Keller, Christoph U.
    Leiden University, The Netherlands.
    Otten, Gilles
    Leiden University, The Netherlands.
    Feldt, Markus
    Max-Planck-Institut für Astronomie, Germany.
    Hippler, Stefan
    Max-Planck-Institut für Astronomie, Germany.
    Huby, Elsa
    Université de Liège, Belgium.
    Mawet, Dmitri
    California Institute of Technology, USA.
    Delacroix, Christian
    Cornell University, USA.
    Surdej, Jean
    Université de Liège, Belgium.
    Habraken, Serge
    Université de Liège, Belgium.
    Forsberg, Pontus
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Karlsson, Mikael
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Vargas Catalan, Ernesto
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Brandl, Bernhard R.
    Leiden University, The Netherlands.
    End-to-end simulations of the E-ELT/METIS coronagraphs2016In: Adaptive Optics Systems V / [ed] Marchetti, E; Close, LM; Veran, JP, SPIE - International Society for Optical Engineering, 2016, 1-10 p., 990973Conference paper (Refereed)
    Abstract [en]

    The direct detection of low-mass planets in the habitable zone of nearby stars is an important science case for future E-ELT instruments such as the mid-infrared imager and spectrograph METIS, which features vortex phase masks and apodizing phase plates (APP) in its baseline design. In this work, we present end-to-end performance simulations, using Fourier propagation, of several METIS coronagraphic modes, including focal-plane vortex phase masks and pupil-plane apodizing phase plates, for the centrally obscured, segmented E-ELT pupil. The atmosphere and the AO contributions are taken into account. Hybrid coronagraphs combining the advantages of vortex phase masks and APPs are considered to improve the METIS coronagraphic performance.

  • 8.
    Carlomagno, Brunella
    et al.
    Université de Liège, Belgium.
    Absil, Olivier
    Université de Liège, Belgium.
    Ruane, Garreth
    Rochester Institute of Technology, USA.
    Mawet, Dimitri
    California Institute of Technology/NASA Jet Propulsion Laboratory, USA.
    Feldt, Markus
    MPIA, Heidelberg, Germany.
    Hippler, Stefan
    MPIA, Heidelberg, Germany.
    Delacroix, Christian
    Centre de Recherche Astrophysique de Lyon, France.
    Forsberg, Pontus
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Habraken, Serge
    Université de Liège, Belgium.
    Huby, Elsa
    Université de Liège, Belgium.
    Karlsson, Mikael
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Surdej, Jean
    Université de Liège, Belgium.
    Vargas Catalan, Ernesto
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Performance evaluation of mid-IR vortex coronagraphs with centrally obscured segmented pupils2015Conference paper (Refereed)
    Abstract [en]

    In its original design, the E-ELT/Metis instrument envisages a vortex coronagraph in the mid-IR regime for detection and characterization of exoplanets, with a contrast of 1e-4 at 2 lambda/D (~40 mas in L band). The AGPM (Annular Groove Phase Mask) is a vortex phase mask with impressive characteristics: small inner working angle, high throughput, achromaticity. A non-perfectly circular pupil and non-flat input wavefront result in a starlight leakage, degrading the performance of the vortex coronagraph. In this work, we present end-to-end performance simulations using Fourier optical propagation to determine the quality of the starlight rejection obtained with an infrared vortex coronagraph. We first analyse the performance facing E-ELT pupil variations (segmentations, central obscuration, spiders, missing segments), then pointing jitter and random adaptive optics residual phase screens are introduced to derive more realistic performance. Finally, more advanced concepts of the infrared vortex coronagraph are presented, in order to compensate for performance degradation.

  • 9. Carlomagno, Brunella
    et al.
    Delacroix, Christian
    Absil, Olivier
    Forsberg, Pontus
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Habraken, Serge
    Jolivet, Aissa
    Karlsson, Mikael
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Mawet, Dimitri
    Piron, Pierre
    Surdej, Jean
    Catalan, Ernesto Vargas
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Mid-IR AGPMs for ELT applications2014In: GROUND-BASED AND AIRBORNE INSTRUMENTATION FOR ASTRONOMY V, 2014, Vol. 9147, 914799Conference paper (Refereed)
    Abstract [en]

    The mid-infrared region is well suited for exoplanet detection thanks to the reduced contrast between the planet and its host star with respect to the visible and near-infrared wavelength regimes. This contrast may be further improved with Vector Vortex Coronagraphs (VVCs), which allow us to cancel the starlight. One flavour of the VVC is the AGPM (Annular Groove Phase Mask), which adds the interesting properties of subwavelength gratings (achromaticity, robustness) to the already known properties of the VVC. In this paper, we present the optimized designs, as well as the expected performances of mid-IR AGPMs etched onto synthetic diamond substrates, which are considered for the E-ELT/METIS instrument.

  • 10. Carlomagno, Brunella
    et al.
    Delacroix, Christian
    Huby, Elsa
    Absil, Olivier
    Mawet, Dimitri
    Jolivet, Aïssa
    Karlsson, Mikael
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Forsberg, Pontus
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Vargas Catalan, Ernesto
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Habraken, Serge
    Surdej, Jean
    Design and performance simulations of mid-IR AGPMs for ELT/METIS applications2015Conference paper (Refereed)
    Abstract [en]

    The direct detection of exoplanets requires the use of dedicated, highcontrast imaging instruments. In this context, vector vortex coronagraphs(VVCs) are considered to be among the most promising solutions to reachhigh contrast at small angular separations. They feature a small innerworking angle (down to 0.9 lambda/D), high throughput, clear off-axis360° discovery space, and are simple to implement. The AGPM (AnnularGroove Phase Mask) is an implementation of the vortex phase mask, whichprovides achromaticity over an appreciable spectral range thanks to the useof sub-wavelength gratings. The grating profile can be optimized based onthe rigorous coupled wave analysis (RCWA) to achieve a quasi-achromaticphase shift up to a very broad band (L+M band: 3.5-5.1μm). These deviceshave been manufactured onto CVD diamond substrates, using reactiveion etching. In this communication, I will first present the latest RCWAConference 9605: Techniques and Instrumentationfor Detection of Exoplanets VIIR eturn to Contents +1 360 676 3290 · help@spie.org 631simulations performed in the L, M and N spectral bands, and for somecombinations of these bands. The resulting optimized AGPMs could beperfectly integrated in the E-ELT/METIS instrument, which aims at detectingand characterizing exoplanets by direct imaging. The target contrast forMETIS is <1e-4 at 2 lambda/D (~40 mas in L band), which translates into apeak rejection rate of few hundreds for the AGPMs. Secondly, the opticalpropagation within the METIS instrument will be studied to determine theperformances of a vortex coronagraph at the focus of METIS. In particular,the effect of the central obstruction, spiders, missing E-ELT segments,and pointing jitter will be analysed, together with the sensitivity to tip-tilt.Finally, the atmosphere and the AO contributions will be considered toobtain more realistic results.

  • 11. Carlomagno, Brunella
    et al.
    Olivier, Absil
    Karlsson, Mikael
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Delacroix, Christian
    Forsberg, Pontus
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Habraken, Serge
    Jolivet, Aïssa
    Mawet, Dimitri
    Piron, Pierre
    Vargas Catalan, Ernesto
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Surdej, Sean
    Design and expected performances ofL, M and N band AGPMs for EELT/METIS.2014Conference paper (Refereed)
  • 12.
    Catalan, Ernesto Vargas
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Forsberg, Pontus
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Huby, Elsa
    Université de Liège, Belgium.
    Carlomagno, Brunella
    Université de Liège, Belgium.
    Jolivet, Aissa
    Université de Liège, Belgium.
    Absil, Olivier
    Université de Liège, Belgium.
    Baudoz, Pierre
    LESIA-Observatoire de Paris, France.
    Vartiainen, Ismo
    University of Eastern Finland, Finland.
    Kuittinen, Markku
    Kuittinen.
    Karlsson, Mikael
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Realizing diamond subwavelength gratings working in the near infrared wavelength region2017Conference paper (Refereed)
  • 13.
    Darwish, Nasser
    et al.
    Universitat de Barcelona, Spain.
    Moreno, Mauricio
    Universitat de Barcelona, Spain.
    Karlsson, Mikael
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Forsberg, Pontus
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Samitier, Josep
    Universitat de Barcelona, Spain.
    Nikolajeff, Fredrik
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Surface plasmon resonance using nanocrystaline diamond substrates2010Conference paper (Refereed)
  • 14. Defrere, D.
    et al.
    Absil, O.
    Hinz, P.
    Kuhn, J.
    Mawet, D.
    Mennesson, B.
    Skemer, A.
    Wallace, K.
    Bailey, V.
    Downey, E.
    Delacroix, C.
    Durney, O.
    Forsberg, Pontus
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Gomez, C.
    Habraken, S.
    Hoffmann, W. F.
    Karlsson, Mikael
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Kenworthy, M.
    Leisenring, J.
    Montoya, M.
    Pueyo, L.
    Skrutskie, M.
    Surdej, J.
    L'-band AGPM vector vortex coronagraph's first light on LBTI/LMIRCam2014In: Adaptive Optics Systems IV, 2014, 91483XConference paper (Refereed)
    Abstract [en]

    We present the first observations obtained with the L'-band AGPM vortex coronagraph recently installed on LBTI/LMIRCam. The AGPM (Annular Groove Phase Mask) is a vector vortex coronagraph made from diamond subwavelength gratings. It is designed to improve the sensitivity and dynamic range of high-resolution imaging at very small inner working angles, down to 0.09 arcseconds in the case of LBTI/LMIRCam in the L' band. During the first hours on sky, we observed the young A5V star HR8799 with the goal to demonstrate the AGPM performance and assess its relevance for the ongoing LBTI planet survey (LEECH). Preliminary analyses of the data reveal the four known planets clearly at high SNR and provide unprecedented sensitivity limits in the inner planetary system (down to the diffraction limit of 0.09 arcseconds).

  • 15.
    Defrère, D.
    et al.
    Steward Observatory, USA.
    Absil, Olivier
    University of Liège, Belgium.
    Kuhn, J.
    Jet Propulsion Laboratory, USA.
    Mawet, Dimitri
    European Southern Observatory, Chile.
    Mennesson, B.
    Jet Propulsion Laboratory, USA.
    Skemer, A.
    Steward Observatory, USA.
    Wallace, K.
    Jet Propulsion Laboratory, USA.
    Bailey, V.
    Steward Observatory, USA.
    Downey, E.
    Steward Observatory, USA.
    Delacroix, Christian
    University of Liège, Belgium.
    Durney, O.
    Steward Observatory, USA.
    Forsberg, Pontus
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Gomez, Carlos
    University of Liège, Belgium.
    Habraken, Serge
    University of Liège, Belgium.
    Karlsson, Mikael
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Kenworthy, M.
    Leiden Observatory, The Netherlands.
    Montoya, M.
    Steward Observatory, USA.
    Pueyo, L.
    Space Telescope Science Institute, USA.
    Skrutskie, M.
    University of Virginia, USA.
    Surdej, Jean
    University of Liège, Belgium.
    L'-band AGPM vector vortex coronagraph's first light on LBTI/LMIRCAM2014Conference paper (Refereed)
  • 16.
    Delacroix, C.
    et al.
    Université de Liège, Belgium.
    Absil, O.
    Université de Liège, Belgium.
    Mawet, D.
    European Southern Observatory, Chile.
    Hanot, C.
    Université de Liège, Belgium.
    Karlsson, Mikael
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Forsberg, Pontus
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Pantin, E.
    CEA Saclay, France.
    Surdej, J.
    Université de Liège, Belgium.
    Habraken, S.
    Université de Liège, Belgium.
    A diamond AGPM coronagraph for VISIR2012In: Proceedings of SPIE: The International Society for Optical Engineering, 2012, 84468K- p.Conference paper (Refereed)
    Abstract [en]

    In recent years, phase mask coronagraphy has become increasingly efficient in imaging the close environment of stars, enabling the search for exoplanets and circumstellar disks. Coronagraphs are ideally suited instruments, characterized by high dynamic range imaging capabilities, while preserving a small inner working angle. The AGPM (Annular Groove Phase Mask, Mawet et al. 20051) consists of a vector vortex induced by a rotationally symmetric subwavelength grating. This technique constitutes an almost unique solution to the achromatization at longer wavelengths (mid-infrared). For this reason, we have specially conceived a mid-infrared AGPM coronagraph for the forthcoming upgrade of VISIR, the mid-IR imager and spectrograph on the VLT at ESO (Paranal), in collaboration with members of the VISIR consortium. The implementation phase of the VISIR Upgrade Project is foreseen for May-August 2012, and the AGPM installed will cover the 11-13.2 μm spectral range. In this paper, we present the entire fabrication process of our AGPM imprinted on a diamond substrate. Diamond is an ideal material for mid-infrared wavelengths owing to its high transparency, small dispersion, extremely low thermal expansion and outstanding mechanical and chemical properties. The design process has been performed with an algorithm based on the rigorous coupled wave analysis (RCWA), and the micro-fabrication has been carried out using nano-imprint lithography and reactive ion etching. A precise grating profile metrology has also been conducted using cleaving techniques. Finally, we show the deposit of fiducials (i.e. centering marks) with Aerosol Jet Printing (AJP). We conclude with the ultimate coronagraph expected performances.

  • 17. Delacroix, Christian
    et al.
    Absil, Olivier
    Carlomagno, Brunella
    Piron, Pierre
    Forsberg, Pontus
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Karlsson, Mikael
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Mawet, Dimitri
    Habraken, Serge
    Surdej, Jean
    Development of a subwavelength grating vortex coronagraph of topological charge 4 (SGVC4)2014In: GROUND-BASED AND AIRBORNE INSTRUMENTATION FOR ASTRONOMY V, 2014, Vol. 9147, 91478YConference paper (Refereed)
    Abstract [en]

    One possible solution to achieve high contrast direct imaging at a small inner working angle (IWA) is to use a vector vortex coronagraph (VVC), which provides a continuous helical phase ramp in the focal plane of the telescope with a phase singularity in its center. Such an optical vortex is characterized by its topological charge, i.e., the number of times the phase accumulates 2 pi radians along a closed path surrounding the singularity. Over the past few years, we have been developing a charge-2 VVC induced by rotationally symmetric subwavelength gratings (SGVC2), also known as the Annular Groove Phase Mask (AGPM). Since 2013, several SGVC2s (or AGPMs) were manufactured using synthetic diamond substrate, then validated on dedicated optical benches, and installed on 10-m class telescopes. Increasing the topological charge seems however mandatory for cancelling the light of bright stars which will be partially resolved by future Extremely Large Telescopes in the near-infrared. In this paper, we first detail our motivations for developing an SGVC4 (charge 4) dedicated to the near-infrared domain. The challenge lies in the design of the pattern which is unrealistic in the theoretically perfect case, due to state-of-the-art manufacturing limitations. Hence, we propose a new realistic design of SGVC4 with minimized discontinuities and optimized phase ramp, showing conclusive improvements over previous works in this field. A preliminary validation of our concept is given based on RCWA simulations, while full 3D finite-difference time-domain simulations (and eventually laboratory tests) will be required for a final validation.

  • 18.
    Delacroix, Christian
    et al.
    Hololab, Université de Liège.
    Absil, Olivier
    IAGL, Université de Liège.
    Forsberg, Pontus
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Mawet, Dimitri
    European Southern Observatory.
    Christiaens, Valentin
    IAGL, Université de Liège.
    Karlsson, Mikael
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Boccaletti, Anthony
    LESIA-Observatoire de Paris.
    Baudoz, Pierre
    LESIA-Observatoire de Paris.
    Kuittinen, Markku
    Department of Physics and Mathematics, University of Eastern Finland.
    Vartiainen, Ismo
    Paul Scherrer Institut.
    Surdej, Jean
    IAGL, Université de Liège.
    Habraken, Serge
    IAGL, Université de Liège.
    Laboratory demonstration of a mid-infrared AGPM vector vortex coronagraph2013In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 553, A98- p.Article in journal (Refereed)
    Abstract [en]

    Context. Coronagraphy is a powerful technique to achieve high contrast imaging, hence to image faint companions around bright targets. Various concepts have been used in the visible and near-infrared regimes, while coronagraphic applications in the mid-infrared nowadays remain largely unexplored. Vector vortex phase masks based on concentric subwavelength gratings show great promise for such applications.

    Aims. We aim at producing and validating the first high-performance broadband focal plane phase mask coronagraphs for applications in the mid-infrared regime, and in particular the L band with a fractional bandwidth of  ~16% (3.5–4.1 μm).

    Methods. Based on rigorous coupled wave analysis, we designed an annular groove phase mask (AGPM) producing a vortex effect in the L band, and etched it onto a series of diamond substrates. The grating parameters were measured by means of scanning electron microscopy. The resulting components were then tested on a mid-infrared coronagraphic test bench.

    Results. A broadband raw null depth of 2 × 10-3 was obtained for our best L-band AGPM after only a few iterations between design and manufacturing. This corresponds to a raw contrast of about 6 × 10-5 (10.5 mag) at 2λ/D. This result is fully in line with our projections based on rigorous coupled wave analysis modelling, using the measured grating parameters. The sensitivity to tilt and focus has also been evaluated.

    Conclusions. After years of technological developments, mid-infrared vector vortex coronagraphs have finally become a reality and live up to our expectations. Based on their measured performance, our L-band AGPMs are now ready to open a new parameter space in exoplanet imaging at major ground-based observatories.

  • 19.
    Delacroix, Christian
    et al.
    Hololab, Université de Liège, Belgien.
    Forsberg, Pontus
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Karlsson, Mikael
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Mawet, Dimitri
    European Southern Observatory (ESO), Santiago, Chile.
    Absil, Olivier
    IAGL, Université de Liège, Belgien.
    Hanot, Charles
    IAGL, Université de Liège, Belgien.
    Surdej, Jean
    IAGL, Université de Liège, Belgien.
    Habraken, Serge
    Hololab, Université de Liège, Belgien.
    Design, manufacturing, and performance analysis of mid-infrared achromatic half-wave plates with diamond subwavelength gratings2012In: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 51, no 24, 5897-5902 p.Article in journal (Refereed)
    Abstract [en]

    In this paper, we present a solution for creating robust monolithic achromatic half-wave plates (HWPs) for the infrared, based on the form birefringence of subwavelength gratings (SWGs) made out of diamond. We use the rigorous coupled wave analysis to design the gratings. Our analysis shows that diamond, besides its outstanding physical and mechanical properties, is a suitable substrate to manufacture mid-infrared HWPs, thanks to its high refractive index, which allows etching SWGs with lower aspect ratio. Based on our optimized design, we manufactured a diamond HWP for the 11-13.2 mu m region, with an estimated mean retardance similar to 3.143 +/- 0.061 rad ( 180.08 +/- 3.51 degrees). In addition, an antireflective grating was etched on the backside of the wave plate, allowing a total transmittance between 89% and 95% over the band.

  • 20.
    Delacroix, Christian
    et al.
    Université de Liège, Belgium.
    Forsberg, Pontus
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Karlsson, Mikael
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Mawet, Dimitri
    European Southern Observatory, Chile.
    Lenaerts, Cedric
    Université de Liège, Belgium.
    Habraken, Serge
    Université de Liège, Belgium.
    Absil, Olivier
    Université de Liège, Belgium.
    Hanot, Charles
    Université de Liège, Belgium.
    Surdej, Jean
    Université de Liège, Belgium.
    First manufactured diamond AGPM vector vortex for the L- and N- bands: metrology and expected performances2010Conference paper (Refereed)
  • 21. Delacroix, Christian
    et al.
    Forsberg, Pontus
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Piron, Pierre
    Ruane, Garreth
    Huby, Elsa
    Carlomagno, Brunella
    Jolivet, Aïssa
    Vargas Catalan, Ernesto
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Absil, Olivier
    Mawet, Dimitri
    Karlsson, Mikael
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Surdej, Jean
    Habraken, Serge
    A family of subwavelength grating vortexcoronagraphs (SGVCs) with higher topological charge2015In: Techniques and Instrumentation for Detection of Exoplanets VII, 2015, Vol. 9605Conference paper (Refereed)
    Abstract [en]

    The subwavelength grating vortex coronagraph (SGVC) is a focal-planespiral-like phase mask whose key benefit is to allow high contrast imaging atsmall angles. Directly etched onto a CVD diamond substrate, it is well suitedto perform in the mid-infrared domain. It provides a continuous helicalphase ramp with a dark singularity in its center, and is characterized by itsnumber of phase revolutions, called the topological charge. Over the pasttwo years, we have manufactured several charge-2 SGVCs (a.k.a. annulargroove phase masks) and successfully demonstrated their performanceson 10-m class telescopes (LBT, VLT/NaCo, VLT/VISIR). To prevent stellarleakage on future 30-m class telescopes (E-ELT, TMT, GMT), a broaderoff-axis extinction is required, which can be achieved by increasing thetopological charge. We have recently proposed an original design for acharge-4 SGVC allowing less starlight to leak through the coronagraph, atthe cost of a degraded inner working angle. In this talk, we report on ourlatest development of higher charge SGVCs. From 3D rigorous numericalsimulations using a finite-difference time-domain (FDTD) algorithm, weConference 9605: Techniques and Instrumentationfor Detection of Exoplanets VIIR eturn to Contents +1 360 676 3290 · help@spie.org 647have derived a family of coronagraphs with higher topological charge(SGVC4/6/8). Our new optimization method addresses the principallimitation of such space-variant polarization state manipulation, i.e., theinconvenient discontinuities in the discrete grating pattern. The resultinggratings offer improved precision to the phase modulation compared toprevious designs. Finally, we present our preliminary manufacturing andmetrology results for infrared components down to the K-band.

  • 22.
    Delacroix, Christian
    et al.
    Liège University, Hololab Group.
    Habraken, Serge
    Liège University, Hololab Group.
    Karlsson, Mikael
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Nikolajeff, Fredrik
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Forsberg, Pontus
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Diamond subwavelength gratings for mid-infrared diamond AGPM coronagraph: manufacturing assessment2010In: EOSAM 2010, Paris, 2010Conference paper (Refereed)
    Abstract [en]

    We present the manufacturing and measurement results obtained with a mid-infrared (L- band ~ 3.8 μm) diamond Annular Groove Phase Mask (AGPM) coronagraph (Mawet et al 20051), using subwavelength gratings and diamond-optimized micro-fabrication techniques such as Nano-Imprint Lithography and Reactive Ion Etching.

     

  • 23.
    Delacroix, Christian
    et al.
    Université de Liège, Belgium.
    Habraken, Serge
    Université de Liège, Belgium.
    Karlsson, Mikael
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Nikolajeff, Fredrik
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Forsberg, Pontus
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Diamond subwavelength gratings for mid-infrared diamond AGPM coronagraph: manufacturing assessment2010Conference paper (Refereed)
  • 24.
    Forsberg, Pontus
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Diamond Microfabrication for Applications in Optics and Chemical Sensing2013Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Diamond is a material with many exceptional properties. In this thesis methods for fabrication of microstructures as well as several applications of such structures in optics, microfluidics and electrochemistry are presented.

    A method for etching deep and highly precise gratings is described. This method was used to fabricate circularly symmetric half wave plates for use in vector vortex coronagraphs. Such coronagraphs are a very promising approach to the direct imaging of extrasolar planets.

    By varying the lateral etch rate of the aluminum mask during diamond etching in an inductively coupled plasma, the sidewall angle of the etched structures could be controlled. This method was used to make smooth sloped sides on a waveguide for coupling light into it. Antireflective structures that drastically reduced the surface reflection in a wavelength band between 10 and 50 µm were also fabricated.

    An array of boron doped diamond microelectrodes for electrochemical measurements in a microchannel was fabricated and tested, showing very good stability and reusability. Several hundred hours of use did not adversely affect their performance and no damage to them could be detected by atomic force microscopy or scanning electron microscopy.

    Superhydrophobic surfaces in diamond were demonstrated, using both hydrogen and fluorine termination. Hydrogen termination on a flat surface gives contact angles below 90°. To achieve a superhydrophobic surface with this low intrinsic hydrophobicity, structures looking like microscopic nail heads were fabricated. The effect of water pressure on immersed superhydrophobic surfaces was also studied and it was found that the collapse of the superhydrophobic state due to pressure was sometimes reversible as the pressure was lowered.

    Finally, a method was tested for functionalizing diamond surfaces using block copolymers of polyethylene oxide and polypropylene oxide to both passivate the surface and to attach synthetic binder molecules. This method was found to give very high signal to noise ratios when detecting C-reactive protein.

    List of papers
    1. High aspect ratio optical gratings in diamond
    Open this publication in new window or tab >>High aspect ratio optical gratings in diamond
    2013 (English)In: Diamond and related materials, ISSN 0925-9635, Vol. 34, 19-24 p.Article in journal (Refereed) Published
    Abstract [en]

    In this paper we describe a process for fabricating high aspect ratio gratings in single- or polycrystalline diamond with the high precision required by micro-optics. Nanoimprint lithography with a soft stamp and several layers of hard masks allowed for rapid and accurate replication of patterns written by e-beam or laser into thick Al masks on diamond substrates as large as 2 cm in diameter. Vertical sidewalls in the mask were crucial for avoiding microvilli formation during diamond plasma etching and were achieved by etching and oxidizing the Al mask in cycles. Circularly symmetric half-wave plates for wavelength bands around 4 and 11 mu m were fabricated with deep circular gratings on one side and antireflective gratings on the other.

    Keyword
    Reactive ion etching, synthetic diamond, plasma etching, grating, optics, interface structure
    National Category
    Manufacturing, Surface and Joining Technology Astronomy, Astrophysics and Cosmology
    Research subject
    Engineering Science with specialization in Microsystems Technology
    Identifiers
    urn:nbn:se:uu:diva-192561 (URN)10.1016/j.diamond.2013.01.009 (DOI)000317795400004 ()
    Available from: 2013-01-22 Created: 2013-01-22 Last updated: 2014-02-03Bibliographically approved
    2. Design, manufacturing, and performance analysis of mid-infrared achromatic half-wave plates with diamond subwavelength gratings
    Open this publication in new window or tab >>Design, manufacturing, and performance analysis of mid-infrared achromatic half-wave plates with diamond subwavelength gratings
    Show others...
    2012 (English)In: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 51, no 24, 5897-5902 p.Article in journal (Refereed) Published
    Abstract [en]

    In this paper, we present a solution for creating robust monolithic achromatic half-wave plates (HWPs) for the infrared, based on the form birefringence of subwavelength gratings (SWGs) made out of diamond. We use the rigorous coupled wave analysis to design the gratings. Our analysis shows that diamond, besides its outstanding physical and mechanical properties, is a suitable substrate to manufacture mid-infrared HWPs, thanks to its high refractive index, which allows etching SWGs with lower aspect ratio. Based on our optimized design, we manufactured a diamond HWP for the 11-13.2 mu m region, with an estimated mean retardance similar to 3.143 +/- 0.061 rad ( 180.08 +/- 3.51 degrees). In addition, an antireflective grating was etched on the backside of the wave plate, allowing a total transmittance between 89% and 95% over the band.

    National Category
    Physical Sciences Engineering and Technology
    Research subject
    Engineering Science with specialization in Microsystems Technology
    Identifiers
    urn:nbn:se:uu:diva-182532 (URN)10.1364/AO.51.005897 (DOI)000308076600020 ()
    Available from: 2012-10-12 Created: 2012-10-11 Last updated: 2013-02-21Bibliographically approved
    3. Laboratory demonstration of a mid-infrared AGPM vector vortex coronagraph
    Open this publication in new window or tab >>Laboratory demonstration of a mid-infrared AGPM vector vortex coronagraph
    Show others...
    2013 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 553, A98- p.Article in journal (Refereed) Published
    Abstract [en]

    Context. Coronagraphy is a powerful technique to achieve high contrast imaging, hence to image faint companions around bright targets. Various concepts have been used in the visible and near-infrared regimes, while coronagraphic applications in the mid-infrared nowadays remain largely unexplored. Vector vortex phase masks based on concentric subwavelength gratings show great promise for such applications.

    Aims. We aim at producing and validating the first high-performance broadband focal plane phase mask coronagraphs for applications in the mid-infrared regime, and in particular the L band with a fractional bandwidth of  ~16% (3.5–4.1 μm).

    Methods. Based on rigorous coupled wave analysis, we designed an annular groove phase mask (AGPM) producing a vortex effect in the L band, and etched it onto a series of diamond substrates. The grating parameters were measured by means of scanning electron microscopy. The resulting components were then tested on a mid-infrared coronagraphic test bench.

    Results. A broadband raw null depth of 2 × 10-3 was obtained for our best L-band AGPM after only a few iterations between design and manufacturing. This corresponds to a raw contrast of about 6 × 10-5 (10.5 mag) at 2λ/D. This result is fully in line with our projections based on rigorous coupled wave analysis modelling, using the measured grating parameters. The sensitivity to tilt and focus has also been evaluated.

    Conclusions. After years of technological developments, mid-infrared vector vortex coronagraphs have finally become a reality and live up to our expectations. Based on their measured performance, our L-band AGPMs are now ready to open a new parameter space in exoplanet imaging at major ground-based observatories.

    Keyword
    coronagraph diamond
    National Category
    Astronomy, Astrophysics and Cosmology Engineering and Technology
    Research subject
    Engineering Science with specialization in Microsystems Technology
    Identifiers
    urn:nbn:se:uu:diva-192563 (URN)10.1051/0004-6361/201321126 (DOI)000319858700098 ()
    Available from: 2013-01-22 Created: 2013-01-22 Last updated: 2014-02-03Bibliographically approved
    4. Inclined surfaces in diamond: broadband antireflective structures and coupling light through waveguides
    Open this publication in new window or tab >>Inclined surfaces in diamond: broadband antireflective structures and coupling light through waveguides
    2013 (English)In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 21, no 3, 2693-2700 p.Article in journal (Refereed) Published
    Abstract [en]

     Control of the sidewall angle of diamond microstructures was achieved by varying the gas mixture, bias power and mask shape during inductively coupled plasma etching. Different etch mechanisms were responsible for the angle of the lower and upper part of the sidewall formed during diamond etching. These angles could to some extent be controlled separately. The developed etch process was used to fabricate wideband antireflective structures with an average transmission of 96.4% for wavelengths between 10 and 50 mu m. Smooth facetted edges for coupling light through waveguides from above were also demonstrated. 

    Keyword
    diamond, etching, waveguide, antireflection
    National Category
    Manufacturing, Surface and Joining Technology Other Physics Topics
    Research subject
    Engineering Science with specialization in Microsystems Technology
    Identifiers
    urn:nbn:se:uu:diva-192566 (URN)10.1364/OE.21.002693 (DOI)000315991400015 ()
    Available from: 2013-01-22 Created: 2013-01-22 Last updated: 2016-04-20
    5. Designed protein binders in combination with nanocrystalline diamond for use in high-sensitivity biosensors
    Open this publication in new window or tab >>Designed protein binders in combination with nanocrystalline diamond for use in high-sensitivity biosensors
    Show others...
    2012 (English)In: Analytical and Bioanalytical Chemistry, ISSN 1618-2642, E-ISSN 1618-2650, Vol. 404, no 6-7, 1643-1651 p.Article in journal (Refereed) Published
    Abstract [en]

    A platform for diagnostic applications showing signal-to-noise ratios that by far surpass those of traditional bioanalytical test formats has been developed. It combines the properties of modified nanocrystalline diamond (NCD) surfaces and those of polyethylene oxide and polypropylene oxide based block copolymers for surface passivation and binder conjugation with a new class of synthetic binders for proteins. The NCD surfaces were fluorine-, hydrogen-, or oxygen-terminated prior to further biofunctionalization and the surface composition was characterized by X-ray photoelectron spectroscopy. In a proof of principle demonstration targeting the C-reactive protein, an ELISA carried out using an F-terminated diamond surface showed a signal-to-noise ratio of 3,900 which compares well to the signal-to-noise of 89 obtained in an antibody-based ELISA on a polystyrene microtiter plate, a standard test format used in most life science laboratories today. The increase in signal-to-noise ratio is to a large extent the result of extremely efficient passivation of the diamond surface. The results suggest that significant improvements can be obtained in standardized test formats using new materials in combination with new types of chemical coatings and receptor molecules.

    Keyword
    Protein binders, Nanocrystalline diamond, CRP, Biosensor, Surface characterization
    National Category
    Natural Sciences Engineering and Technology
    Research subject
    Engineering Science with specialization in Microsystems Technology
    Identifiers
    urn:nbn:se:uu:diva-184455 (URN)10.1007/s00216-012-6245-7 (DOI)000309348400004 ()
    Available from: 2012-11-09 Created: 2012-11-07 Last updated: 2014-10-15Bibliographically approved
    6. From Hydrophilic to Superhydrophobic: Fabrication of Micrometer-Sized Nail-Head-Shaped Pillars in Diamond
    Open this publication in new window or tab >>From Hydrophilic to Superhydrophobic: Fabrication of Micrometer-Sized Nail-Head-Shaped Pillars in Diamond
    2010 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 26, no 2, 889-893 p.Article in journal (Refereed) Published
    Abstract [en]

    The hydrophobicity of microtextured diamond surfaces was investigated. Pillarlike structures were fabricated in both nanocrystalline diamond and microcrystalline diamond. By changing the surface termination of the textured diamond surface, we could switch between superhydrophobic surfaces and hydrophilic surfaces. Examined terminations were hydrogen, fluorine, and oxygen. To evaluate the wetting properties, advancing and receding contact angles were measured. By designing pillars with a wide diamond top on a narrower silicon stem, superhydrophobicity was achieved even when the advancing contact angle on the unstructured diamond surface was below 70°. The possibility to manipulate the hydrophobicity and the Fresnel reflection simultaneously at an infrared wavelength is also demonstrated.

    Keyword
    superhydrophobic diamond nanocrystalline polycrystalline cassie wenzel
    National Category
    Condensed Matter Physics Engineering and Technology
    Identifiers
    urn:nbn:se:uu:diva-135623 (URN)10.1021/la902361c (DOI)000273403400038 ()
    Note

    PMID: 19775135

    Available from: 2010-12-07 Created: 2010-12-07 Last updated: 2014-12-11
    7. Cassie-Wenzel and Wenzel-Cassie transitions on immersed superhydrophobic surfaces under hydrostatic pressure
    Open this publication in new window or tab >>Cassie-Wenzel and Wenzel-Cassie transitions on immersed superhydrophobic surfaces under hydrostatic pressure
    2011 (English)In: Soft Matter, ISSN 1744-683X, Vol. 7, no 1, 104-109 p.Article in journal (Refereed) Published
    Abstract [en]

    For incorporating superhydrophobic surfaces in microfluidic systems, it is important to understand the ability of the superhydrophobic state to withstand hydraulic pressure. In this paper we describe experiments to probe the collapse transition on superhydrophobic surfaces completely covered by water, where the air film formed on the surface is closed. Polyethylene foils nanoimprinted with micrometre sized pillars in different geometries and densities are used as the model superhydrophobic surfaces. The pressure required for the transition from Cassie to Wenzel state is measured for all surfaces and also compared to analytical and numerical models. We find that the closed film of trapped air helps stabilise the Cassie state at low pillar densities and that the effect of a small change in pillar sidewall angle can drastically change the collapse behaviour. Finally, the reverse transition, from Wenzel to Cassie state, is observed on densely pillared surfaces at low water pressure.

    National Category
    Physical Chemistry Engineering and Technology
    Research subject
    Engineering Science with specialization in Microsystems Technology
    Identifiers
    urn:nbn:se:uu:diva-134448 (URN)10.1039/C0SM00595A (DOI)000285360200015 ()
    Available from: 2010-11-26 Created: 2010-11-26 Last updated: 2014-12-16
    8. Fabrication of boron doped diamond microband electrodes for electrochemical detection in a microfluidic channel
    Open this publication in new window or tab >>Fabrication of boron doped diamond microband electrodes for electrochemical detection in a microfluidic channel
    Show others...
    2011 (English)In: Diamond and related materials, ISSN 0925-9635, E-ISSN 1879-0062, Vol. 20, no 8, 1121-1124 p.Article in journal (Refereed) Published
    Abstract [en]

    The manufacturing and electrochemical characterisation of an array of 20 boron doped nanocrystalline diamond (BNCD) microband electrodes for use in a poly(dimethylsiloxane) (PDMS) based microfluidic system are described. The electrodes were fabricated by plasma etching of a silicon oxide- and BNCD thin film coated silicon wafer and the resulting surface structured silicon wafer was subsequently bonded to the PDMS so that the BNCD microband electrodes were located within the PDMS microchannel. The electrochemical performance of the BNCD electrodes was studied and the electrodes were found to exhibit significantly better stability than previously employed gold microband arrays.

    Keyword
    Nanocrystalline, Diamond film, Electrodes, Electrochemical applications, Micro electromechanical systems, Sensors
    National Category
    Engineering and Technology Inorganic Chemistry
    Research subject
    Engineering Science with specialization in Microsystems Technology; Inorganic Chemistry
    Identifiers
    urn:nbn:se:uu:diva-160514 (URN)10.1016/j.diamond.2011.06.024 (DOI)000295300800004 ()
    Available from: 2011-10-25 Created: 2011-10-25 Last updated: 2016-04-20
  • 25.
    Forsberg, Pontus
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Delacroix, Christian
    Université de Liège, Belgium.
    Mawet, Dimitri
    European Southern Observatory, Chile.
    Absil, Olivier
    Université de Liège, Belgium.
    Hanot, Charles
    Université de Liège, Belgium.
    Habraken, Serge
    Université de Liège, Belgium.
    Surdej, Jean
    Université de Liège, Belgium.
    Karlsson, Mikael
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Etching High Aspect Ratio Optical Gratings in Diamond2012Conference paper (Refereed)
  • 26.
    Forsberg, Pontus
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Delacroix, Christian
    Université de Liège, Belgium.
    Mawet, Dimitri
    European Southern Observatory, Chile.
    Absil, Olivier
    Université de Liège, Belgium.
    Hanot, Charles
    Université de Liège, Belgium.
    Habraken, Serge
    Université de Liège, Belgium.
    Surdej, Jean
    Université de Liège, Belgium.
    Karlsson, Mikael
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Fabricating an annular groove phase mask in diamond2012Conference paper (Refereed)
  • 27.
    Forsberg, Pontus
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Jorge, Eleonora de Oliveira
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry, Inorganic Chemistry.
    Nyholm, Leif
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry, Inorganic Chemistry.
    Nikolajeff, Fredrik
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Karlsson, Mikael
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Fabrication of boron doped diamond microband electrodes for electrochemical detection in a microfluidic channel2011In: Diamond and related materials, ISSN 0925-9635, E-ISSN 1879-0062, Vol. 20, no 8, 1121-1124 p.Article in journal (Refereed)
    Abstract [en]

    The manufacturing and electrochemical characterisation of an array of 20 boron doped nanocrystalline diamond (BNCD) microband electrodes for use in a poly(dimethylsiloxane) (PDMS) based microfluidic system are described. The electrodes were fabricated by plasma etching of a silicon oxide- and BNCD thin film coated silicon wafer and the resulting surface structured silicon wafer was subsequently bonded to the PDMS so that the BNCD microband electrodes were located within the PDMS microchannel. The electrochemical performance of the BNCD electrodes was studied and the electrodes were found to exhibit significantly better stability than previously employed gold microband arrays.

  • 28.
    Forsberg, Pontus
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Karlsson, Mikael
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    High aspect ratio optical gratings in diamond2013In: Diamond and related materials, ISSN 0925-9635, Vol. 34, 19-24 p.Article in journal (Refereed)
    Abstract [en]

    In this paper we describe a process for fabricating high aspect ratio gratings in single- or polycrystalline diamond with the high precision required by micro-optics. Nanoimprint lithography with a soft stamp and several layers of hard masks allowed for rapid and accurate replication of patterns written by e-beam or laser into thick Al masks on diamond substrates as large as 2 cm in diameter. Vertical sidewalls in the mask were crucial for avoiding microvilli formation during diamond plasma etching and were achieved by etching and oxidizing the Al mask in cycles. Circularly symmetric half-wave plates for wavelength bands around 4 and 11 mu m were fabricated with deep circular gratings on one side and antireflective gratings on the other.

  • 29.
    Forsberg, Pontus
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Karlsson, Mikael
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Inclined surfaces in diamond: broadband antireflective structures and coupling light through waveguides2013In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 21, no 3, 2693-2700 p.Article in journal (Refereed)
    Abstract [en]

     Control of the sidewall angle of diamond microstructures was achieved by varying the gas mixture, bias power and mask shape during inductively coupled plasma etching. Different etch mechanisms were responsible for the angle of the lower and upper part of the sidewall formed during diamond etching. These angles could to some extent be controlled separately. The developed etch process was used to fabricate wideband antireflective structures with an average transmission of 96.4% for wavelengths between 10 and 50 mu m. Smooth facetted edges for coupling light through waveguides from above were also demonstrated. 

  • 30.
    Forsberg, Pontus
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Malmström, Mikael
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Vargas Catalan, Ernesto
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Karlsson, Mikael
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Diamond grating waveplates2016In: Optical Materials Express, ISSN 2159-3930, E-ISSN 2159-3930, Vol. 6, no 6, 2024-2030 p.Article in journal (Refereed)
    Abstract [en]

    Two designs of diamond quarter-wave plates for CO2 lasers, based on the birefringence of sub-wavelength gratings, were manufactured and tested. In one design the grating was etched on the surface of a 300 µm thick polycrystalline diamond substrate. The other consisted of a diamond grating hanging freely in air, suspended at the edges from a silicon frame. The free-hanging design, while more fragile, had several advantages both in terms of fabrication and performance such as a larger grating period, higher transmission, and no need for an antireflective treatment of the backside.

  • 31.
    Forsberg, Pontus
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Nikolajeff, Fredrik
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Karlsson, Mikael
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Wettability control and superhydrophobicity on diamond2010Conference paper (Refereed)
  • 32.
    Forsberg, Pontus S. H.
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Priest, Craig
    Brinkmann, Martin
    Sedev, Rossen
    Ralston, John
    Contact Line Pinning on Microstructured Surfaces for Liquids in the Wenzel State2010In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 26, no 2, 860-865 p.Article in journal (Refereed)
    Abstract [en]

    The wettability of surfaces microstructured with square pillars was studied, where the static advancing contact angle on the planar surface was 72 degrees. We observed elevated advancing angles (up to 140 degrees) on these structures for droplets in the Wenzel state. No air was trapped in the structured surf ices beneath the liquid, ruling out the well-known Lotus leaf effect. Instead, we show that the apparent hydrophobicity is related to contact line pinning at the pillar edges, giving a strong dependence of wetting hysteresis oil the fraction of the contact line pinned on pillars. Simulating the contact line pinning oil these Surfaces showed similar behavior to our measurements, revealing both strong pinning at the edges of the pillars as well as mechanistic details.

  • 33.
    Forsberg, Pontus
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Vargas, Ernesto
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Delacroix, Christian
    Absil, Olivier
    Carlomagno, Brunella
    Mawet, Dimitri
    Habraken, Serge
    Surdej, Jean
    Karlsson, Mikael
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Realizing the diamond annular groove phase masks for the mid infrared region - five years of successful process development of diamond plasma etching2014Conference paper (Refereed)
  • 34.
    Fromell, Karin
    et al.
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Immunology, Genetics and Pathology, Clinical Immunology.
    Forsberg, Pontus
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Karlsson, Mikael
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Larsson, Karin
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Inorganic Chemistry.
    Nikolajeff, Fredrik
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Baltzer, Lars
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - BMC, Physical Organic Chemistry.
    Designed protein binders in combination with nanocrystalline diamond for use in high-sensitivity biosensors2012In: Analytical and Bioanalytical Chemistry, ISSN 1618-2642, E-ISSN 1618-2650, Vol. 404, no 6-7, 1643-1651 p.Article in journal (Refereed)
    Abstract [en]

    A platform for diagnostic applications showing signal-to-noise ratios that by far surpass those of traditional bioanalytical test formats has been developed. It combines the properties of modified nanocrystalline diamond (NCD) surfaces and those of polyethylene oxide and polypropylene oxide based block copolymers for surface passivation and binder conjugation with a new class of synthetic binders for proteins. The NCD surfaces were fluorine-, hydrogen-, or oxygen-terminated prior to further biofunctionalization and the surface composition was characterized by X-ray photoelectron spectroscopy. In a proof of principle demonstration targeting the C-reactive protein, an ELISA carried out using an F-terminated diamond surface showed a signal-to-noise ratio of 3,900 which compares well to the signal-to-noise of 89 obtained in an antibody-based ELISA on a polystyrene microtiter plate, a standard test format used in most life science laboratories today. The increase in signal-to-noise ratio is to a large extent the result of extremely efficient passivation of the diamond surface. The results suggest that significant improvements can be obtained in standardized test formats using new materials in combination with new types of chemical coatings and receptor molecules.

  • 35. Huby, Elsa
    et al.
    Absil, Olivier
    Serabyn, E
    Baudoz, Pierre
    Delacroix, Christian
    Jolivet, Aïssa
    Piron, Pierre
    Vargas Catalan, Ernesto
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Forsberg, Pontus
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Karlsson, Mikael
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Carlomagno, Brunella
    Ruane, G
    Habraken, Serge
    Gomez Gonzales, Carlos
    Wertz, Olivier
    Surdej, Jean
    Absil, Pierre-Antoine
    Christiaens, Valentin
    Defrère, Denis
    Girard, J
    Hinz, P
    Milli, Julien
    Pantin, E
    Van Droogenbroeck, Marc
    The vortex coronagraph:from laboratory characterizationto on-sky operation2015Conference paper (Refereed)
  • 36.
    Karlsson, Mikael
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Forsberg, Pontus
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Nikolajeff, Fredrik
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    From Hydrophilic to Superhydrophobic: Fabrication of Micrometer-Sized Nail-Head-Shaped Pillars in Diamond2010In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 26, no 2, 889-893 p.Article in journal (Refereed)
    Abstract [en]

    The hydrophobicity of microtextured diamond surfaces was investigated. Pillarlike structures were fabricated in both nanocrystalline diamond and microcrystalline diamond. By changing the surface termination of the textured diamond surface, we could switch between superhydrophobic surfaces and hydrophilic surfaces. Examined terminations were hydrogen, fluorine, and oxygen. To evaluate the wetting properties, advancing and receding contact angles were measured. By designing pillars with a wide diamond top on a narrower silicon stem, superhydrophobicity was achieved even when the advancing contact angle on the unstructured diamond surface was below 70°. The possibility to manipulate the hydrophobicity and the Fresnel reflection simultaneously at an infrared wavelength is also demonstrated.

  • 37.
    Karlsson, Mikael
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Forsberg, Pontus
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Vargas Catalan, Ernesto
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Absil, Olivier
    University of Liège, Belgium.
    Mawet, Dimitri
    European Southern Observatory, Chile..
    Delacroix, Christian
    University of Liège, Belgium.
    Carlomagno, Brunella
    University of Liège, Belgium.
    Habraken, Serge
    University of Liège, Belgium.
    Surdej, Jean
    University of Liège, Belgium.
    Diamond Optics for Direct Imaging of Extrasolar Planets2014Conference paper (Refereed)
  • 38.
    López-Lorente, Ángela
    et al.
    University of Ulm, Germany.
    Wang, Pei
    University of Ulm, Germany.
    Wang, Xiaofeng
    University of Ulm, Germany.
    Sieger, Markus
    University of Ulm, Germany.
    Karlsson, Mikael
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Forsberg, Pontus
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Nikolajeff, Fredrik
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Österlund, Lars
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Mizaikoff, Boris
    University of Ulm, Germany.
    Mid-infrared chem/bio sensors based on thin-film diamond wave-guides combined with quantum cascade lasers2015Conference paper (Refereed)
  • 39.
    Malmström, Mikael
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Cai, Yixiao
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Karlsson, Mikael
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Forsberg, Pontus
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Nikolajeff, Fredrik
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Laurell, Fredrik
    Royal Institute of Technology (KTH), Stockholm.
    Diamond waveguides for mid-IR sensing2014Conference paper (Other academic)
  • 40.
    Malmström, Mikael
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Forsberg, Pontus
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Cai, Yixiao
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Karlsson, Mikael
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Nikolajeff, Fredrik
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Laurell, Fredrik
    Royal Institute of Technology (KTH), Stockholm.
    Diamond waveguides for mid-IR chemical sensing2015Conference paper (Refereed)
  • 41.
    Malmström, Mikael
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences. Royal Inst Technol, Dept Appl Phys, Laser Phys, Albanova, S-10691 Stockholm, Sweden.
    Karlsson, Mikael
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences. Mol Fingerprint Sweden AB, Eksatravagen 130, SE-75655 Uppsala, Sweden.
    Forsberg, Pontus
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Cai, Yixiao
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Nikolajeff, Fredrik
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences. Mol Fingerprint Sweden AB, Eksatravagen 130, SE-75655 Uppsala, Sweden.
    Laurell, Fredrik
    Laser Physics, Department of Applied Physics, Royal Institute of Technology.
    Waveguides in polycrystalline diamond for mid-IR sensing2016In: Optical Materials Express, ISSN 2159-3930, E-ISSN 2159-3930, Vol. 6, no 4, 1286-1295 p.Article in journal (Refereed)
    Abstract [en]

    8 mm long channel waveguides were manufactured in polycrystalline diamond with inductively coupled plasma etching and characterized in terms of mode-profile and propagation loss in the 1.5 – 3.4 μm spectral region. As proof of principle, the waveguides were evaluated in an evanescent field sensing setup targeting the CH absorption peak of isopropanol at ~3.4 μm, showing good agreement with numerical finite element simulations.

  • 42.
    Mawet, Dimitri
    et al.
    European Southern Observatory, Chile.
    Absil, Olivier
    Université de Liège, Belgium.
    Delacroix, Christian
    Université de Liège, Belgium.
    Girard, J. H.
    European Southern Observatory, Chile.
    Milli, J.
    European Southern Observatory, Chile.
    O'Neal, J.
    European Southern Observatory, Chile.
    Baudoz, Pierre
    LESIA, Observatoire de Paris, France.
    Boccaletti, A.
    LESIA, Observatoire de Paris, France.
    Bourget, P.
    European Southern Observatory, Chile.
    Christiaens, V.
    Université de Liège, Belgium.
    Forsberg, Pontus
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Gonte, F.
    European Southern Observatory, Chile.
    Habraken, Serge
    Université de Liège, Belgium.
    Hanot, C.
    Université de Liège, Belgium.
    Karlsson, Mikael
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Kasper, M.
    European Southern Observatory Headquarters, Germany.
    Lizon, J. -L
    European Southern Observatory Headquarters, Germany.
    Muzic, K.
    European Southern Observatory, Chile.
    Olivier, R.
    GDTech s.a., Belgium.
    Pena, E.
    European Southern Observatory, Chile.
    Slusarenko, N.
    European Southern Observatory, Chile.
    Tacconi-Garman, L. E.
    European Southern Observatory Headquarters, Germany.
    Surdej, J.
    Université de Liège, Belgium.
    L '-band AGPM vector vortex coronagraph's first light on VLT/NACO Discovery of a late-type companion at two beamwidths from an F0V star2013In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 552, L13- p.Article in journal (Refereed)
    Abstract [en]

    Context. High contrast imaging has thoroughly combed through the limited search space accessible with first-generation ground-based adaptive optics instruments and the Hubble Space Telescope. Only a few objects were discovered, and many non-detections reported and statistically interpreted. The field is now in need of a technological breakthrough. Aims. Our aim is to open a new search space with first-generation systems such as NACO at the Very Large Telescope, by providing ground-breaking inner working angle (IWA) capabilities in the L' band. The L' band is a sweet spot for high contrast coronagraphy since the planet-to-star brightness ratio is favorable, while the Strehl ratio is naturally higher. Methods. An annular groove phase mask (AGPM) vector vortex coronagraph optimized for the L' band made from diamond subwavelength gratings was manufactured and qualified in the lab. The AGPM enables high contrast imaging at very small IWA, potentially being the key to unexplored discovery space. Results. Here we present the installation and successful on-sky tests of an L'-band AGPM coronagraph on NACO. Using angular differential imaging, which is well suited to the rotational symmetry of the AGPM, we demonstrated a Delta L' > 7.5 mag contrast from an IWA similar or equal to 0 ''.09 onwards, during average seeing conditions, and for total integration times of a few hundred seconds.

  • 43.
    Mawet, Dimitri
    et al.
    European Southern Observatory, Chile.
    Absil, Olivier
    Université de Liège, Belgium.
    Girard, Julien
    European Southern Observatory, Chile.
    O’Neal, Jared
    European Southern Observatory, Chile.
    Delacroix, Christian
    Université de Liège, Belgium.
    Baudoz, Pierre
    LESIA, Observatoire de Paris, France.
    Boccaletti, Anthony
    LESIA, Observatoire de Paris, France.
    Bourget, Pierre
    European Southern Observatory, Chile.
    Christiaens, Valentin
    Université de Liège, Belgium.
    Forsberg, Pontus
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Gonté, Frederic
    European Southern Observatory, Chile.
    Habraken, Serge
    Université de Liège, Belgium.
    Hanot, Charles
    Université de Liège, Belgium.
    Karlsson, Mikael
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Kasper, Markus
    European Southern Observatory, Germany.
    Lagrange, Anne-Marie
    Université Joseph Fourier, France.
    Lizon, Jean-Louis
    European Southern Observatory, Chile.
    Muzic, Koraljka
    European Southern Observatory, Chile.
    Peña, Eduardo
    European Southern Observatory, Chile.
    Olivier, Richard
    GDTech s.a., Belgium.
    Slusarenko, Nicolas
    European Southern Observatory, Chile.
    Tacconi-Garman, Lowell
    European Southern Observatory, Chile.
    Surdej, Jean
    Université de Liège, Belgium.
    High Contrast Imaging with the New Vortex Coronagraph on NACO2013In: The Messenger (ESO), Vol. 152, 8-13 p.Article, review/survey (Refereed)
  • 44.
    Mawet, Dimitri
    et al.
    European Southern Observatory, Chile.
    Absil, Olivier
    Université de Liège, Belgium.
    Milli, Julien
    European Southern Observatory, Chile.
    Baudoz, P.
    LESIA, Observatoire de Paris, France.
    Boccaletti, A.
    LESIA, Observatoire de Paris, France.
    Chauvin, G.
    IPAG, University Joseph Fourier, France.
    Delacroix, Christian
    Université de Liège, Belgium.
    Girard, G.
    European Southern Observatory, Chile.
    Lagrange, A.M.
    IPAG, University Joseph Fourier, France.
    O’Neal, J.
    European Southern Observatory, Chile.
    Bourget, P.
    European Southern Observatory, Chile.
    Forsberg, Pontus
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Gonte, F.
    European Southern Observatory, Chile.
    Habraken, Serge
    University of Liège, Belgium.
    Hanot, C.
    University of Liège, Belgium.
    Karlsson, Mikael
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Kasper, M.
    European Southern Observatory, Germany.
    Lizon, J.L.
    European Southern Observatory, Germany.
    Muzic, K.
    European Southern Observatory, Chile.
    Olivier, R.
    GDTech s.a., Belgium.
    Pena, E.
    European Southern Observatory, Chile.
    Slusarenko, N.
    European Southern Observatory, Chile.
    Tacconi-Garman, L.E.
    IPAG, University Joseph Fourier, France.
    Surdej, Jean
    University of Liège, Belgium.
    Companion search around β Pictoris with the newly commissioned L’-band vector vortex coronagraph on VLT/NACO2013Conference paper (Refereed)
  • 45.
    Mawet, Dimitri
    et al.
    European Southern Observatory, Chile.
    Absil, Olivier
    Université de Liège, Belgium.
    Milli, Julien
    European Southern Observatory, Chile.
    Delacroix, Christian
    Université de Liège, Belgium.
    Girard, Julien
    European Southern Observatory, Chile.
    O’Neal, Jared
    European Southern Observatory, Chile.
    Baudoz, Pierre
    LESIA, Observatoire de Paris, France.
    Boccaletti, Anthony
    Université de Liège, Belgium.
    Bourget, Pierre
    European Southern Observatory, Chile.
    Forsberg, Pontus
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Gonté, Frederic
    European Southern Observatory, Chile.
    Habraken, Serge
    Université de Liège, Belgium.
    Karlsson, Mikael
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Kasper, Markus
    European Southern Observatory Headquarters, Germany.
    Lagrange, Anne-Marie
    Institut de Planétologie et d’Astrophysique de Grenoble, France.
    Lizon, Jean-Louis
    European Southern Observatory, Chile.
    Muzic, Koraljka
    European Southern Observatory, Chile.
    Pena, Eduardo
    European Southern Observatory, Chile.
    Olivier, Richard
    GDTech s.a., Belgium.
    Slusarenko, Nicolas
    European Southern Observatory, Chile.
    Tacconi-Garman, Lowell
    European Southern Observatory Headquarters, Germany.
    Surdej, Jean
    Université de Liège, Belgium.
    Small-angle, high-contrast exoplanet imaging with the L-band AGPM vector vortex coronagraph now offered at the VLT2013Conference paper (Refereed)
  • 46.
    Mawet, Dimitri
    et al.
    California Institute of Technology/Jet Propulsion Laboratory (NASA), USA.
    Choquet, Élodie
    Jet Propulsion Laboratory (NASA), USA.
    Absil, Olivier
    Université de Liège, Belgium.
    Huby, Elsa
    Université de Liège, Belgium.
    Bottom, Michael
    California Institute of Technology/Jet Propulsion Laboratory (NASA), USA.
    Serabyn, Eugene
    Jet Propulsion Laboratory (NASA), USA.
    Femenia, Bruno
    W. M. Keck Observatory, USA.
    Lebreton, Jérémy
    NASA Exoplanet Science Institute, California Institute of Technology, USA.
    Matthews, Keith
    California Institute of Technology, USA.
    Gomez Gonzalez, Carlos A.
    Université de Liège, Belgium.
    Wertz, Olivier
    Argelander-Institut fur Astronomie, Germany.
    Carlomagno, Brunella
    Université de Liège, Belgium.
    Christiaens, Valentin
    Universidad de Chile, Chile.
    Defrére, Denis
    University of Arizona, USA.
    Delacroix, Christian
    Cornell University, USA.
    Forsberg, Pontus
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Habraken, Serge
    Université de Liège, Belgium.
    Jolivet, Aissa
    Université de Liège, Belgium.
    Karlsson, Mikael
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Milli, Julien
    European Southern Observatory, Chile.
    Pinte, Christophe
    Univ. Grenoble Alpes, France.
    Piron, Pierre
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Reggiani, Maddalena
    Université de Liège, Belgium.
    Surdej, Jean
    Université de Liège, Belgium.
    Vargas Catalan, Ernesto
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Characterization of the inner disk around HD 141569 A from KECK/NIRC2 L-band vortex coronagraphy2017In: Astronomical Journal, ISSN 0004-6256, E-ISSN 1538-3881, Vol. 153, no 1, 1-10 p., 44Article in journal (Refereed)
    Abstract [en]

    HD 141569 A is a pre-main sequence B9.5 Ve star surrounded by a prominent and complex circumstellar disk, likely still in a transition stage from protoplanetary to debris disk phase. Here, we present a new image of the third inner disk component of HD 141569 A made in the L′ band (3.8 μm) during the commissioning of the vector vortex coronagraph that has recently been installed in the near-infrared imager and spectrograph NIRC2 behind the W. M. Keck Observatory Keck II adaptive optics system. We used reference point-spread function subtraction, which reveals the innermost disk component from the inner working distance of ;23 au and up to ;70 au. The spatial scale of our detection roughly corresponds to the optical and near-infrared scattered light, thermal Q, N, and 8.6 μm PAH emission reported earlier. We also see an outward progression in dust location from the L′ band to the H  band (Very Large Telescope/ SPHERE image)  to the visible (Hubble Space Telescope (HST)/ STIS image), which is likely indicative of dust blowout. The warm disk component is nested deep inside the two outer belts imaged by HST-NICMOS in 1999 ( at 406 and 245 au, respectively) . We fit our new L′ -band image and spectral energy distribution of HD 141569 A with the radiative transfer code MCFOST. Our best-fit models favor pure olivine grains and are consistent with the composition of the outer belts. While our image shows a putative very faint point-like clump or source embedded in the inner disk, we did not detect any true companion within the gap between the inner disk and the first outer ring, at a sensitivity of a few Jupiter masses.

  • 47.
    Mawet, Dimitri
    et al.
    European Southern Observatory, Chile.
    Murakami, Naoshi
    Hokkaido University, Japan.
    Delacroix, Christian
    University of Liège, Belgium.
    Serabyn, Eugene
    Jet Propulsion Laboratory - California Institute of Technology, USA.
    Absil, Olivier
    University of Liège, Belgium.
    Baba, Naoshi
    Hokkaido University, Japan.
    Baudrand, Jacques
    LESIA, Observatoire de Paris, France.
    Boccaletti, Anthony
    LESIA, Observatoire de Paris, France.
    Burruss, Rick
    Jet Propulsion Laboratory - California Institute of Technology, USA.
    Chipman, Russell
    University of Arizona, USA.
    Forsberg, Pontus
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Habraken, Serge
    University of Liège, Belgium.
    Hamaguchi, Shoki
    Hokkaido University, Japan.
    Hanot, Charles
    LESIA, Observatoire de Paris, France.
    Ise, Akitoshi
    Hokkaido University, Japan.
    Karlsson, Mikael
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
    Kern, Bryan
    Jet Propulsion Laboratory - California Institute of Technology, USA.
    Krist, John
    Jet Propulsion Laboratory - California Institute of Technology, USA.
    Kuhnert, Andreas
    Jet Propulsion Laboratory - California Institute of Technology, USA.
    Levine, Marie
    Jet Propulsion Laboratory - California Institute of Technology, USA.
    Liewer, Kurt
    Jet Propulsion Laboratory - California Institute of Technology, USA.
    McClain, Stephen
    University of Arizona, USA.
    McEldowney, Scott
    Microsoft, USA.
    Mennesson, Bertrand
    Jet Propulsion Laboratory - California Institute of Technology, USA.
    Moody, Dwight
    Jet Propulsion Laboratory - California Institute of Technology, USA.
    Murakami, Hiroshi
    Japan Aerospace Exploration Agency, Japan.
    Niessner, Albert
    Jet Propulsion Laboratory - California Institute of Technology, USA.
    Nishikawa, Jun
    National Astronomical Observatory of Japan, Japan.
    O’Brien, Nada
    JDSU, USA.
    Oka, Kazuhiko
    Hokkaido University, Japan.
    Park, Peggy
    Jet Propulsion Laboratory - California Institute of Technology, USA.
    Piron, Pierre
    University of Liège, Belgium.
    Pueyo, Laurent
    Space Telescope Science Institute, USA.
    Riaud, Pierre
    LESIA, Observatoire de Paris, France.
    Sakamoto, Moritsugu
    Hokkaido University, Japan.
    Tamura, Motohide
    Japan Aerospace Exploration Agency, Japan.
    Trauger, John
    Jet Propulsion Laboratory - California Institute of Technology, USA.
    Shemo, David
    JDSU, USA.
    Surdej, Jean
    University of Liège, Belgium.
    Tabiryan, Nelson
    BEAM Engineering for Advanced Measurements Co., USA.
    Traub, Wesley
    Jet Propulsion Laboratory - California Institute of Technology, USA.
    Wallace, James
    Jet Propulsion Laboratory - California Institute of Technology, USA.
    Yokochi, Kaito
    Tokyo University of Agriculture and Technology, Japan.
    Taking the vector vortex coronagraph to the next level for ground- and space-based exoplanet imaging instruments: review of technology developments in the USA, Japan, and Europe2011Conference paper (Refereed)
  • 48.
    Milli, J.
    et al.
    European Southern Observatory (ESO), Chile.
    Hibon, P.
    European Southern Observatory (ESO), Chile.
    Christiaens, V.
    Universidad de Chile, Chile.
    Choquet, É.
    Jet Propulsion Laboratory/California Institute of Technology, USA.
    Bonnefoy, M.
    Univ. Grenoble Alpes, France.
    Kennedy, G.M.
    University of Cambridge, UK.
    Wyatt, M.C.
    University of Cambridge, UK.
    Absil, O.
    Université de Liège, Belgium.
    Gómez González, C.A.
    Université de Liège, Belgium.
    del Burgo, C.
    Instituto Nacional de Astrofísica, Mexico.
    Matrà, L.
    University of Cambridge, UK.
    Augereau, J-C.
    Univ. Grenoble Alpes, France.
    Boccaletti, A.
    Observatoire de Paris, France.
    Delacroix, C.
    Cornell University, USA.
    Ertel, S.
    Steward Observatory, University of Arizona, USA.
    Dent, W.R.F.
    Atacama Large Millimeter/submillimeter Array (ALMA), Chile.
    Forsberg, Pontus
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Fusco, T.
    ONERA, The French Aerospace Lab, France.
    Girard, J.H.
    European Southern Observatory (ESO), Chile.
    Habraken, S.
    Université de Liège, Belgium.
    Huby, E.
    Université de Liège, Belgium.
    Karlsson, Mikael
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Lagrange, A-M.
    Univ. Grenoble Alpes, France.
    Mawet, D.
    Jet Propulsion Laboratory/California Institute of Technology, USA.
    Mouillet, D.
    Univ. Grenoble Alpes, France.
    Perrin, M.
    Space Telescope Science Institute, USA.
    Pinte, C.
    Univ. Grenoble Alpes, France.
    Pueyo, L.
    Space Telescope Science Institute, USA.
    Reyes, C
    European Southern Observatory (ESO), Chile.
    Soummer, R.
    Space Telescope Science Institute, USA.
    Surdej, J.
    Université de Liège, Belgium.
    Tarricq, Y.
    European Southern Observatory (ESO), Chile.
    Wahhaj, Z.
    European Southern Observatory (ESO), Chile.
    Discovery of a low-mass companion inside the debris ring surrounding the F5V star HD 2068932017In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 597, L2Article in journal (Refereed)
    Abstract [en]

    Aims. Uncovering the ingredients and the architecture of planetary systems is a very active field of research that has fuelled many new theories on giant planet formation, migration, composition, and interaction with the circumstellar environment. We aim at discovering and studying new such systems, to further expand our knowledge of how low-mass companions form and evolve.

    Methods. We obtained high-contrast H-band images of the circumstellar environment of the F5V star HD 206893, known to host a debris disc never detected in scattered light. These observations are part of the SPHERE High Angular Resolution Debris Disc Survey (SHARDDS) using the InfraRed Dual-band Imager and Spectrograph (IRDIS) installed on VLT/SPHERE.

    Results. We report the detection of a source with a contrast of 3.6 × 10−5 in the H-band, orbiting at a projected separation of 270 milliarcsecond or 10 au, corresponding to a mass in the range 24 to 73MJup for an age of the system in the range 0.2 to 2 Gyr. The detection was confirmed ten months later with VLT/NaCo, ruling out a background object with no proper motion. A faint extended emission compatible with the disc scattered light signal is also observed.

    Conclusions. The detection of a low-mass companion inside a massive debris disc makes this system an analog of other young planetary systems such as β Pictoris, HR 8799 or HD 95086 and requires now further characterisation of both components to understand their interactions.

  • 49. Semprebon, Ciro
    et al.
    Forsberg, Pontus
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Priest, Craig
    Brinkmann, Martin
    Pinning and wicking in regular pillar arrays2014In: Soft Matter, ISSN 1744-683X, Vol. 10, no 31, 5739-5748 p.Article in journal (Refereed)
    Abstract [en]

    Pinning and wicking of a liquid meniscus in a square array of pillars is investigated in numerical energy minimizations and compared to wetting experiments. Our combined study shows that criteria for spontaneous film formation, based on thermodynamic considerations as well as on simple geometric modelling of the meniscus shape, are insufficient to predict the onset of wicking. High aspect ratio pillars with a square cross-section may display a re-entrant pinning regime as the density of the pillars is increased, a behaviour that is captured by neither of the aforementioned models. Numerically computed energy landscapes for the advancing meniscus allow us to explain the re-entrant behaviour in terms of energy barriers between topologically different meniscus shapes. Our numerical results are validated by wicking experiments where for the material contact angle theta(0) = 47 degrees the re-entrant behaviour is present for square pillars and absent for pillars with circular cross section.

  • 50.
    Serabyn, E
    et al.
    Jet Propulsion Laboratory (NASA), USA.
    Huby, E
    Université de Liège, Belgium.
    Matthews, K
    California Institute of Technology, USA.
    Mawet, D
    California Institute of Technology, USA.
    Absil, O
    Université de Liège, Belgium.
    Femenia, B
    W. M. Keck Observatory, USA.
    Wizinowich, P
    W. M. Keck Observatory, USA.
    Karlsson, Mikael
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Bottom, M
    California Institute of Technology, USA.
    Campbell, R
    W. M. Keck Observatory, USA.
    Carlomagno, B
    Université de Liège, Belgium.
    Defrère, D
    Université de Liège, Belgium.
    Delacroix, C
    Université de Liège, Belgium.
    Forsberg, Pontus
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Gomez Gonzalez, C
    Université de Liège, Belgium.
    Habraken, S
    Université de Liège, Belgium.
    Jolivet, A
    Université de Liège, Belgium.
    Liewer, K
    Jet Propulsion Laboratory (NASA), USA.
    Lilley, S
    W. M. Keck Observatory, USA.
    Piron, Pierre
    Université de Liège, Belgium.
    Reggiani, M
    Université de Liège, Belgium.
    Surdej, J
    Université de Liège, Belgium.
    Tran, H
    W. M. Keck Observatory, USA.
    Vargas Catalan, Ernesto
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Wertz, O
    Université de Liège, Belgium.
    The W. M. Keck Observatory infrared vortex coronagraph and a first image of HIP79124 B2017In: Astronomical Journal, ISSN 0004-6256, E-ISSN 1538-3881, Vol. 153, no 1, 1-7 p., 43Article in journal (Refereed)
    Abstract [en]

    An optical vortex coronagraph has been implemented within the NIRC2 camera on the Keck II telescope and used to carry out on-sky tests and observations. The development of this new L′-band observational mode is described, and an initial demonstration of the new capability is presented: a resolved image of the low-mass companion to HIP 79124, which had previously been detected by means of interferometry. With HIP 79124 B at a projected separation of 186.5 mas, both the small inner working angle of the vortex coronagraph and the related imaging improvements were crucial in imaging this close companion directly. Due to higher Strehl ratios and more relaxed contrasts in L′ band versus H band, this new coronagraphic capability will enable high-contrast, small-angle observations of nearby young exoplanets and disks on a par with those of shorter-wavelength extreme adaptive optics coronagraphs.

12 1 - 50 of 55
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