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Karlsson, Mikael
Publications (10 of 117) Show all publications
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
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
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
Mawet, D., Choquet, É., Absil, O., Huby, E., Bottom, M., Serabyn, E., . . . Vargas Catalan, E. (2017). Characterization of the inner disk around HD 141569 A from KECK/NIRC2 L-band vortex coronagraphy. Astronomical Journal, 153(1), 1-10, Article ID 44.
Open this publication in new window or tab >>Characterization of the inner disk around HD 141569 A from KECK/NIRC2 L-band vortex coronagraphy
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2017 (English)In: Astronomical Journal, ISSN 0004-6256, E-ISSN 1538-3881, Vol. 153, no 1, p. 1-10, article id 44Article in journal (Refereed) Published
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.

Keywords
planet-disk interactions; planetary systems; planets and satellites: formation; protoplanetary disks; stars: pre-main sequence; stars: variables: T Tauri, Herbig Ae/Be
National Category
Engineering and Technology Astronomy, Astrophysics and Cosmology
Identifiers
urn:nbn:se:uu:diva-311377 (URN)10.3847/1538-3881/153/1/44 (DOI)000405784300002 ()
Available from: 2016-12-26 Created: 2016-12-26 Last updated: 2018-03-23Bibliographically approved
Hamberg, M., Vargas Catalan, E., Karlsson, M., Dancila, D., Rydberg, A., Ögren, J., . . . Vartiainen, I. (2017). Dielectric Laser Acceleration Setup Design, Grating Manufacturing and Investigations Into Laser Induced RF Cavity Breakdowns. In: Proceedings of FEL2017, Santa Fe, NM, USA: . Paper presented at 38th International Free-Electron Laser Conference, Santa Fe, 20-25 Aug..
Open this publication in new window or tab >>Dielectric Laser Acceleration Setup Design, Grating Manufacturing and Investigations Into Laser Induced RF Cavity Breakdowns
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2017 (English)In: Proceedings of FEL2017, Santa Fe, NM, USA, 2017Conference paper, Published paper (Refereed)
National Category
Accelerator Physics and Instrumentation Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-336087 (URN)978-3-95450-179-3 (ISBN)
Conference
38th International Free-Electron Laser Conference, Santa Fe, 20-25 Aug.
Available from: 2017-12-12 Created: 2017-12-12 Last updated: 2017-12-14Bibliographically approved
Milli, J., Hibon, P., Christiaens, V., Choquet, É., Bonnefoy, M., Kennedy, G., . . . Wahhaj, Z. (2017). Discovery of a low-mass companion inside the debris ring surrounding the F5V star HD 206893. Astronomy and Astrophysics, 597, Article ID L2.
Open this publication in new window or tab >>Discovery of a low-mass companion inside the debris ring surrounding the F5V star HD 206893
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2017 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 597, article id L2Article in journal (Refereed) Published
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.

National Category
Engineering and Technology Astronomy, Astrophysics and Cosmology
Identifiers
urn:nbn:se:uu:diva-309599 (URN)10.1051/0004-6361/201629908 (DOI)000392392900143 ()
Funder
EU, FP7, Seventh Framework Programme, 337569
Available from: 2016-12-05 Created: 2016-12-05 Last updated: 2017-11-29Bibliographically approved
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