Dr. Christian Schneider Profile

Dr. Christian Schneider

at Ctr. Suisse d'Electronique et de Microtechnique SA

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Publications (7)

Proceedings Article | 15 April 2024 Presentation

Advanced microlens origination by thermal reflow

Frédéric Zanella, Mohamed Lahmar, Christian Schneider, Luka Ciric, Guillaume Basset

Proceedings Volume PC12898, PC1289805 (2024) https://doi.org/10.1117/12.3003227

KEYWORDS: Microlens, Wafer level optics, Vertical cavity surface emitting lasers, Photoresist materials, Optical sensors, Wafer-level optics, Transparency, Solar concentrators, Semiconducting wafers, Optical properties

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Proceedings Article | 9 June 2023 Presentation

Optimization of microlens arrays for photon detectors

Frédéric Zanella, Christian Schneider, Luka Ciric, Guillaume Basset

Proceedings Volume PC12570, PC1257005 (2023) https://doi.org/10.1117/12.2666068

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Proceedings Article | 15 March 2023 Presentation + Paper

UV-replicated microlenses for quantum devices

Frédéric Zanella, Christian Schneider, Luka Ciric, Guillaume Basset

Proceedings Volume 12430, 124300C (2023) https://doi.org/10.1117/12.2648224

KEYWORDS: Vertical cavity surface emitting lasers, Photon counting, Microlens array, Microlens, Single photon avalanche diodes, Silicon photomultipliers, Quantum devices, Semiconducting wafers, Image sensors, Photodetectors

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Proceedings Article | 11 June 2021 Open Access

Blazed gratings on convex substrates for high throughput spectrographs for Earth and Universe observation

Frédéric Zamkotsian, Igor Zhurminsky, Patrick Lanzoni, Nicolas Tchoubaklian, Fabian Lütolf, Marc Schnieper, Christian Schneider, Sören Fricke, Marin Fouchier, Myriam Zerrad, Claude Amra, Vincent Costes, Jacques Loesel

Proceedings Volume 11852, 118520N (2021) https://doi.org/10.1117/12.2599169

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In next generation space instrumentation for Earth and Universe Observation, new instrument concepts include often non planar gratings. Their realization is complex and costly. We propose a new technology for designing and realizing convex blazed gratings for high throughput spectrographs. For this purpose, our requirements are driven by a Digital-Micromirror-Device-based (DMD) MOS instrument to be mounted on the Telescopio Nazionale Galileo (TNG) and called BATMAN. The two-arm instrument is providing in parallel imaging and spectroscopic capabilities. The objects/field selector is a 2048 x 1080 micromirrors DMD, placed at the focal plane of the telescope; it is used as a programmable multi-slit mask at the entrance of the spectrograph. The compact Offner-type spectrograph design contains a low density convex grating to disperse light. For optimization of the spectrograph efficiency, this convex grating must be blazed. A blazed reflective grating has been designed with a period of 3300 nm and a blaze angle of 5.04°, and fabricated into convex substrates with 225 mm radius of curvature and a footprint diameter of 63.5 mm. The blaze is optimized for the center wavelength of 580 nm within the spectral range of 400 – 800 nm. Such gratings have been fabricated and coated with a silver-based layer, with a final 7° blaze angle over the whole surface. Efficiency close to 90% on the 1st diffraction order at 700nm has been obtained, measured on BATMAN spectroscopic arm. Detailed mapping of the blazed grating showed a very good period uniformity with up to 0.5% deviation. Grating depth and blaze angle have higher deviation, up to 7%. An optimized device with the exact required blaze angle would reach the same efficiency and be centered on the mid of 400-800nm wavelength band: its realization is on-going. The grating brings a significant contribution in the total amount of straylight at instrument level. Their straylight level remains a critical issue, and its reduction by specific and controlled implementation of improvements in manufacturing process is a challenge to tackle. Preliminary straylight measurement has been done and shows a lowest straylight level below 10^-2 sr^-1 between the diffraction orders. This new type of non-planar reflective gratings will be the key component for future high throughput spectrographs in space missions.

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Proceedings Article | 6 April 2020 Presentation

Fabrication of arrays of quasi-micro-beads for massively parallel nanojet super-resolution imaging (Conference Presentation)

Guillaume Basset, Angélique Luu-Dinh, Christian Schneider, Daniel Schlup, Stéphane Perrin, Wang Fangting, Sylvain Lecler

Proceedings Volume 11368, 1136803 (2020) https://doi.org/10.1117/12.2555994

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Proceedings Article | 26 February 2020 Paper

Hybrid plasmonic-dielectric resonant waveguide grating for wavelength-selective diffraction

Giorgio Quaranta, Christian Schneider, Benjamin Gallinet

Proceedings Volume 11289, 112890U (2020) https://doi.org/10.1117/12.2543775

KEYWORDS: Waveguides, Diffraction gratings, Diffraction, Optical filters, Plasmonics, Coating, Refractive index, Nanoimprint lithography, Surface plasmons, Dielectrics

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Proceedings Article | 12 July 2019 Open Access

Convex blazed gratings for high throughput spectrographs in space missions

Frédéric Zamkotsian, Igor Zhurminsky, Patrick Lanzoni, Nicolas Tchoubaklian, Christian Schneider, Sören Fricke, Marc Schnieper, Fabian Lütolf, Clément Luitot, Vincent Costes

Proceedings Volume 11180, 1118051 (2019) https://doi.org/10.1117/12.2536100

KEYWORDS: Spectrographs, Diffraction gratings, Space operations, Molybdenum, Spectroscopes, Optical design, Digital micromirror devices, Imaging spectroscopy, Reflectivity, Aerospace engineering

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