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Karlsson, Mikael
Publications (10 of 120) Show all publications
Jolivet, A., Orban de Xivry, G., Huby, E., Piron, P., Vargas Catalan, E., Habraken, S., . . . Absil, O. (2019). L- and M-band AGPMs in-lab performance assessment on the Vortex Optical Demonstrator for Coronagraphic Applications (VODCA). Journal of Astronomical Telescopes, Instruments, and Systems
Open this publication in new window or tab >>L- and M-band AGPMs in-lab performance assessment on the Vortex Optical Demonstrator for Coronagraphic Applications (VODCA)
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2019 (English)In: Journal of Astronomical Telescopes, Instruments, and Systems, ISSN 2329-4221Article in journal (Refereed) Accepted
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
urn:nbn:se:uu:diva-360447 (URN)
Available from: 2018-09-13 Created: 2018-09-13 Last updated: 2019-03-21
Piron, P., Vargas Catalan, E., Absil, O. & Karlsson, M. (2018). Birefringence measurements of diamond space-variant subwavelength gratings. Applied Optics, 57(17), 4909-4917
Open this publication in new window or tab >>Birefringence measurements of diamond space-variant subwavelength gratings
2018 (English)In: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 57, no 17, p. 4909-4917Article in journal (Refereed) Published
Abstract [en]

Subwavelength gratings are gratings with periods smaller than the incident wavelength. They possess form birefringence, which depends on the grating parameters. This paper presents the results of an experimental method designed to measure the birefringent properties of diamond subwavelength gratings in the mid-infrared. The method consists of monitoring the intensity transmitted through one polarizer, a subwavelength grating, and a second polarizer for various orientations of the first polarizer. By fitting the intensity variation as a function of the orientation of the first polarizer, one can compute the phase shift induced by the grating, its local fast axis orientation, and the ratio of the transverse electric and transverse magnetic transmission efficiencies. The paper describes the method principle and its mathematical model. Then, several numerical simulations of different subwavelength gratings are presented and their results are discussed. Finally, the optical setup is described and the measurements of one subwavelength grating are displayed and compared with the values expected from the manufacturing process.

National Category
Engineering and Technology Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:uu:diva-346522 (URN)10.1364/AO.57.004909 (DOI)000434872300025 ()30118109 (PubMedID)
Funder
Swedish Research Council, 621-2014-5959Carl Tryggers foundation , CTS 15:259EU, European Research Council, 337569
Available from: 2018-03-19 Created: 2018-03-19 Last updated: 2018-08-24Bibliographically approved
Almandoz-Gil, L., Welander, H., Ihse, E., Khoonsari, P. E., Musunuri, S., Lendel, C., . . . Bergström, J. (2018). Corrigendum to “Low molar excess of 4-oxo-2-nonenal and 4-hydroxy-2-nonenal promote oligomerization of alpha-synuclein through different pathways” [Free Rad. Biol. Med. (2017) 421–431]. Free Radical Biology & Medicine, 117, 258-258
Open this publication in new window or tab >>Corrigendum to “Low molar excess of 4-oxo-2-nonenal and 4-hydroxy-2-nonenal promote oligomerization of alpha-synuclein through different pathways” [Free Rad. Biol. Med. (2017) 421–431]
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2018 (English)In: Free Radical Biology & Medicine, ISSN 0891-5849, E-ISSN 1873-4596, Vol. 117, p. 258-258Article in journal (Refereed) Published
National Category
Biochemistry and Molecular Biology Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-356238 (URN)10.1016/j.freeradbiomed.2018.02.007 (DOI)000427420600025 ()29455934 (PubMedID)
Note

Correction to: Free Radical Biology & Medicine, vol. 110, pages 421-431.

DOI: 10.1016/j.freeradbiomed.2017.07.004

WoS title: Low molar excess of 4-oxo-2-nonenal and 4-hydroxy-2-nonenal promote oligomerization of alpha-synuclein through different pathways (vol 110, pg 421, 2017)

Available from: 2018-07-27 Created: 2018-07-27 Last updated: 2018-10-19Bibliographically approved
Piron, P., Vargas Catalan, E., Haas, J., Österlund, L., Nikolajeff, F., Andersson, P. O., . . . Karlsson, M. (2018). Development of a diamond waveguide sensor for sensitive protein analysis using IR quantum cascade lasers. In: Yakov G. Soskind (Ed.), SPIE Proceedings Volume 10539: Photonic Instrumentation, Engineering V. Paper presented at SPIE OPTO - Photonics West 2018 - Conference on Photonic Instrumentation Engineering V, San Francisco, CA, USA. January 27-February 1, 2018..
Open this publication in new window or tab >>Development of a diamond waveguide sensor for sensitive protein analysis using IR quantum cascade lasers
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2018 (English)In: SPIE Proceedings Volume 10539: Photonic Instrumentation, Engineering V / [ed] Yakov G. Soskind, 2018Conference paper, Oral presentation with published abstract (Refereed)
National Category
Engineering and Technology Physical Sciences Basic Medicine
Identifiers
urn:nbn:se:uu:diva-340857 (URN)10.1117/12.2289844 (DOI)000432598300012 ()978-1-5106-1564-9 (ISBN)
Conference
SPIE OPTO - Photonics West 2018 - Conference on Photonic Instrumentation Engineering V, San Francisco, CA, USA. January 27-February 1, 2018.
Funder
Carl Tryggers foundation Swedish Research Council, 6212014-5959EU, Horizon 2020, 645758
Available from: 2018-02-04 Created: 2018-02-04 Last updated: 2018-08-30Bibliographically approved
Reggiani, M., Christiaens, V., Absil, O., Mawet, D., Huby, E., Choquet, E., . . . Wertz, O. (2018). Discovery of a point-like source and a third spiral arm in the transition disk around the Herbig Ae star MWC 758. Astronomy and Astrophysics, 611, Article ID A74.
Open this publication in new window or tab >>Discovery of a point-like source and a third spiral arm in the transition disk around the Herbig Ae star MWC 758
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2018 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 611, article id A74Article in journal (Refereed) Published
Abstract [en]

Context. Transition disks offer the extraordinary opportunity to look for newly born planets and to investigate the early stages of planet formation. Aims. In this context we observed the Herbig A5 star MWC 758 with the L'-band vector vortex coronagraph installed in the near-infrared camera and spectrograph NIRC2 at the Keck II telescope, with the aim of unveiling the nature of the spiral structure by constraining the presence of planetary companions in the system. Methods. Our high-contrast imaging observations show a bright (Delta L' = 7.0 +/- 0.3 mag) point-like emission south of MWC 758 at a deprojected separation of similar to 20 au (r = 0 ''.111 +/- 0 ''.004) from the central star. We also recover the two spiral arms (southeast and northwest), already imaged by previous studies in polarized light, and discover a third arm to the southwest of the star. No additional companions were detected in the system down to 5 Jupiter masses beyond 0 ''.6 from the star. Results. We propose that the bright L'-band emission could be caused by the presence of an embedded and accreting protoplanet, although the possibility of it being an asymmetric disk feature cannot be excluded. The spiral structure is probably not related to the protoplanet candidate, unless on an inclined and eccentric orbit, and it could be due to one (or more) yet undetected planetary companions at the edge of or outside the spiral pattern. Future observations and additional simulations will be needed to shed light on the true nature of the point-like source and its link with the spiral arms.

Place, publisher, year, edition, pages
EDP Sciences, 2018
Keywords
protoplanetary disks, planet-disk interactions, stars: pre-main sequence, stars: individual: MWC 758 (HD 36112)
National Category
Engineering and Technology Astronomy, Astrophysics and Cosmology
Identifiers
urn:nbn:se:uu:diva-335382 (URN)10.1051/0004-6361/201732016 (DOI)000428688400003 ()
Funder
EU, European Research Council, 337569
Available from: 2017-12-04 Created: 2017-12-04 Last updated: 2018-08-10Bibliographically approved
Kenworthy, M. A., Snik, F., Keller, C. U., Doelman, D., Por, E. H., Absil, O., . . . Taylor, W. D. (2018). High contrast imaging for the enhanced resolution imager and spectrometer (ERIS). In: Evans, CJ Simard, L Takami, H (Ed.), GROUND-BASED AND AIRBORNE INSTRUMENTATION FOR ASTRONOMY VII: . Paper presented at Conference on Ground-Based and Airborne Instrumentation for Astronomy VII, JUN 10-14, 2018, Austin, TX, USA. SPIE-INT SOC OPTICAL ENGINEERING, Article ID 1070246.
Open this publication in new window or tab >>High contrast imaging for the enhanced resolution imager and spectrometer (ERIS)
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2018 (English)In: GROUND-BASED AND AIRBORNE INSTRUMENTATION FOR ASTRONOMY VII / [ed] Evans, CJ Simard, L Takami, H, SPIE-INT SOC OPTICAL ENGINEERING , 2018, article id 1070246Conference paper, Published paper (Refereed)
Abstract [en]

ERIS is a diffraction limited thermal infrared imager and spectrograph for the Very Large Telescope UT4. One of the science cases for ERIS is the detection and characterization of circumstellar structures and exoplanets around bright stars that are typically much fainter than the stellar diffraction halo. Enhanced sensitivity is provided through the combination of (i) suppression of the diffraction halo of the target star using coronagraphs, and (ii) removal of any residual diffraction structure through focal plane wavefront sensing and subsequent active correction. In this paper we present the two coronagraphs used for diffraction suppression and enabling high contrast imaging in ERIS.

Place, publisher, year, edition, pages
SPIE-INT SOC OPTICAL ENGINEERING, 2018
Series
Proceedings of SPIE, ISSN 0277-786X, E-ISSN 1996-756X ; 10702
Keywords
ERIS, NIX, VLT, Adaptive Optics, Apodizing Phase Plate, Vortex Coronagraph, Focal Plane Coronagraphy
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
urn:nbn:se:uu:diva-373547 (URN)10.1117/12.2313964 (DOI)000452664300102 ()978-1-5106-1958-6 (ISBN)
Conference
Conference on Ground-Based and Airborne Instrumentation for Astronomy VII, JUN 10-14, 2018, Austin, TX, USA
Available from: 2019-01-17 Created: 2019-01-17 Last updated: 2019-01-17Bibliographically approved
Haas, J., Vargas Catalan, E., Piron, P., Karlsson, M. & Mizaikoff, B. (2018). Infrared Spectroscopy based on Broadly Tunable Quantum Cascade Lasers and Polycrystalline Diamond Waveguide. Analyst, 143(21), 5112-5119
Open this publication in new window or tab >>Infrared Spectroscopy based on Broadly Tunable Quantum Cascade Lasers and Polycrystalline Diamond Waveguide
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2018 (English)In: Analyst, ISSN 0003-2654, Vol. 143, no 21, p. 5112-5119Article in journal (Refereed) Published
National Category
Engineering and Technology Analytical Chemistry
Identifiers
urn:nbn:se:uu:diva-346526 (URN)10.1039/C8AN00919H (DOI)
Available from: 2018-03-19 Created: 2018-03-19 Last updated: 2018-10-22
Kaeufl, H. U., Kasper, M., Arsenaut, R., Jakob, G., Leveratto, S., Zins, G., . . . Dohlen, K. (2018). NEAR: New Earths in the Alpha Cen Region (bringing VISIR as a "visiting instrument" to ESO-VLT-UT4). In: Evans, CJ Simard, L Takami, H (Ed.), Ground-Based And Airborne Instrumentation For Astronomy VII: . Paper presented at Conference on Ground-Based and Airborne Instrumentation for Astronomy VII, JUN 10-14, 2018, Austin, TX. , Article ID UNSP 107020D.
Open this publication in new window or tab >>NEAR: New Earths in the Alpha Cen Region (bringing VISIR as a "visiting instrument" to ESO-VLT-UT4)
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2018 (English)In: Ground-Based And Airborne Instrumentation For Astronomy VII / [ed] Evans, CJ Simard, L Takami, H, 2018, article id UNSP 107020DConference paper, Published paper (Refereed)
Abstract [en]

ESO in collaboration with the Breakthrough Initiatives, is adding a dedicated coronagraph to the Very Large Telescope mid-IR imager (VISIR) to further boost the high dynamic range imaging capability of this instrument. After the VISIR upgrade in 2012, where coronagraphic masks were first added to VISIR, it became evident that coronagraphy at a ground-based 8m-class telescope, even at wavelengths as long as 10 mu m, critically needs adaptive optics. For VISIR, a work-horse observatory facility instrument in normal operations, this is "easiest" achieved by bringing VISIR as a visiting instrument to the ESO-VLT-UT4 having an adaptive M2. This "visit" enables a meaningful search for Earth-like planets in the habitable zone around both alpha-Cen(1) and alpha-Cen(2). Meaningful here means, achieving a contrast of approximate to 10(-6) within approximate to 0.8 arcsec from the star. Various measures to improve the sensitivity of VISIR will be applied, especially a dedicated filter, faster chopping and a Strehl-ratio close to 100% thanks to extreme adaptive optics. This should allow to detect a planet twice the diameter of Earth in 50 h on source integration time. Key components will be a diffractive coronagraphic mask, the annular groove phase mask (AGPM), optimized for the most sensitive spectral band-pass in the N-band, complemented by a sophisticated apodizer at the level of the Lyot stop. For VISIR noise filtering based on fast chopping is required. A novel internal chopper system will be integrated into the cryostat. This chopper is based on the standard technique from early radio astronomy, conceived by the microwave pioneer Robert Dicke in 1946, which was instrumental for the discovery of the 3K microwave background. For risk mitigation all components are being tested and quali fi ed under realistic conditions in the lab at ESO headquarters before integration into the instrument. The performance or suppression of the coronagraph is so good, that a non-thermal source (vulgo a laser) is needed on the test-bench. We will give an overview of the optical changes to VISIR, the implementation of wave front sensing, the Dicke switch design and laboratory testing, the AGPM design and laboratory testing, non common path error control with a ZELDA mask, sensitivity and contrast estimates, data flow and analysis, the overall project status, plan and outlook Needless to say that this project is of critical interest for future infrared instrumentation at the next generation of extremely large telescopes aiming at surveying the solar neighborhood for terrestrial planets by detecting and characterizing them based on their mid-IR fluxes.

Series
Proceedings of SPIE, ISSN 0277-786X, E-ISSN 1996-756X ; 10702
Keywords
exo-Earth, alpha-Cen, habitable zone, coronagraphy, apodization, extreme AO, thermal infrared
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
urn:nbn:se:uu:diva-373095 (URN)10.1117/12.2313395 (DOI)000452664300007 ()978-1-5106-1958-6 (ISBN)
Conference
Conference on Ground-Based and Airborne Instrumentation for Astronomy VII, JUN 10-14, 2018, Austin, TX
Available from: 2019-01-11 Created: 2019-01-11 Last updated: 2019-01-11Bibliographically approved
Haas, J., Vargas Catalan, E., Piron, P., Nikolajeff, F., Österlund, L., Karlsson, M. & Mizaikoff, B. (2018). Polycrystalline diamond thin-film waveguides for mid-infrared evanescent field sensors. ACS Omega, 3(6), 6190-6198
Open this publication in new window or tab >>Polycrystalline diamond thin-film waveguides for mid-infrared evanescent field sensors
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2018 (English)In: ACS Omega, ISSN 2470-1343, Vol. 3, no 6, p. 6190-6198Article in journal (Refereed) Published
Abstract [en]

Photonic design and optimization of thin-film polycrystalline diamond waveguides are shown, serving as advanced evanescent field transducers in the mid-infrared fingerprint regime (2000-909 cm(-1); 5-11 mu m). Design constraints inherent to optical/system considerations and the material were implemented in a finite element method (FEM)-based simulation method that allowed three-dimensional modeling of the overall structure. Thus, lateral mode confinement, attenuation in the direction of radiation propagation, and physical resilience were evaluated. In a final step, the designed structures were fabricated, and their utility in combination with a broadly tunable external cavity quantum cascade laser for chemical sensing of a liquid phase analyte was demonstrated.

National Category
Analytical Chemistry Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-346523 (URN)10.1021/acsomega.8b00623 (DOI)000436340500029 ()
Funder
Carl Tryggers foundation Swedish Research CouncilSwedish National Infrastructure for Computing (SNIC), 2016-7-107
Available from: 2018-03-19 Created: 2018-03-19 Last updated: 2018-10-12Bibliographically approved
Vargas Catalan, E., Piron, P., Jolivet, A., Forsberg, P., Delacroix, C., Huby, E., . . . Karlsson, M. (2018). Subwavelength diamond gratings for vortex coronagraphy: towards annular groove phase mask for shorter wavelengths and topological charge 4 designs. Optical Materials Express, 8(7), 1976-1987
Open this publication in new window or tab >>Subwavelength diamond gratings for vortex coronagraphy: towards annular groove phase mask for shorter wavelengths and topological charge 4 designs
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2018 (English)In: Optical Materials Express, ISSN 2159-3930, E-ISSN 2159-3930, Vol. 8, no 7, p. 1976-1987Article in journal (Refereed) Published
National Category
Engineering and Technology Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:uu:diva-346520 (URN)10.1364/OME.8.001976 (DOI)000437453500028 ()
Funder
EU, FP7, Seventh Framework Programme, 337569Swedish Research Council, 621-2014-5959Carl Tryggers foundation , CTS 15:259
Available from: 2018-03-19 Created: 2018-03-19 Last updated: 2018-09-19Bibliographically approved
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