Mr. Guillaume Basset Profile

Guillaume Basset

Group Leader Micro Nano Optics at CSEM SA

SPIE Involvement:

Author

Publications (18)

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 | 12 March 2024 Presentation

Scalable and versatile chip to fiber optical interconnects

Guillaume Basset, Roger Krähenbühl, Martina Renggli, Stefan Mohrdiek

Proceedings Volume PC12892, PC1289206 (2024) https://doi.org/10.1117/12.3003107

KEYWORDS: Fiber optics, Semiconducting wafers, Photonic integrated circuits, Design and modelling, Waveguides, Structured optical fibers, Reflection, Optical switching, Optical interconnects, Optical gratings

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Proceedings Article | 7 August 2023 Paper

PHABULOuS: manufacturing of large surfaces with free-form micro-optics

Ton Offermans, Frédéric Zanella, Guillaume Basset

Proceedings Volume 12624, 126240P (2023) https://doi.org/10.1117/12.2675845

KEYWORDS: Manufacturing, Ultraviolet radiation, Design and modelling, Optics manufacturing, Micro optics, Computer aided design, Optical design, Tolerancing, Optical components, Nanostructures

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Proceedings Article | 12 July 2023 Open Access

Convex blazed gratings for high throughput spectrographs in space missions

Frédéric Zamkotsian, Roger Krähenbühl, Patrick Lanzoni, Guillaume Basset, Michel Lequime, Myriam Zerrad, Claude Amra, Vincent Costes, Jacques Loesel

Proceedings Volume 12777, 127772J (2023) https://doi.org/10.1117/12.2689996

KEYWORDS: Blazed gratings, Optical gratings, Equipment, Spectrographs, Astronomical imaging, Reflection gratings, Optical surfaces, Spectroscopes, Diffraction gratings, Diffraction

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In next generation space and ground-based 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, the requirements are driven by a Digital-Micromirror-Device-based (DMD) MOS instrument we are developing, 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 grating has been fabricated by using lithography, angular Ar ion etching, transfer of the blazed grating from a flat surface onto a convex substrate with a flexible stamp, etched into the substrate by RIE etching. and finally 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. 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 wavefront error of the diffracted beam will also be optimized. 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. Straylight measurement has been done and shows a BRDF cosθ values of 10^-8 sr^-1 on the optical surface and 10^-7 sr^-1 on the structured features. 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 | 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

Manufacturing acceleration of free-form micro-optical arrays (FMOAs) with CAD algorithms

Frédéric Zanella, Oscar Fernandez, Ton Offermans, Tamara Aderneuer, Julio Chaves, Ruben Mohedano, Guillaume Basset

Proceedings Volume 12433, 124330F (2023) https://doi.org/10.1117/12.2647854

KEYWORDS: Computer aided design, Manufacturing, Point clouds, Solids, Optics manufacturing, Data modeling, Visualization, Algorithm development, Tolerancing, Solid modeling

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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 | 9 March 2023 Presentation

Flat waveguides enabling ultra-compact wafer-based atomic clocks

Benjamin Gallinet, Jacques Haesler, Roger Krähenbühl, Steve Lecomte, Guillaume Basset

Proceedings Volume PC12447, PC124470D (2023) https://doi.org/10.1117/12.2649283

KEYWORDS: Atomic clocks, Waveguides, Wafer-level optics, Satellite navigation systems, Optical fabrication equipment, Networks, Beam shaping, Time metrology, Telecommunications, Semiconducting wafers

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Proceedings Article | 29 August 2022 Presentation + Paper

Blazed gratings on convex substrates for high throughput spectrographs

Frédéric Zamkotsian, Roger Krähenbühl, Patrick Lanzoni, Guillaume Basset, Michel Lequime, Myriam Zerrad, Claude Amra, Vincent Costes, Jacques Loesel

Proceedings Volume 12188, 1218824 (2022) https://doi.org/10.1117/12.2630045

KEYWORDS: Spectrographs, Diffraction gratings, Optical design, Diffraction, Digital micromirror devices, Bidirectional reflectance transmission function, Reflectivity, Imaging spectroscopy

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In next generation space and ground-based 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, the requirements are driven by a Digital-Micromirror-Device-based (DMD) MOS instrument we are developing, 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 grating has been fabricated by using lithography, angular Ar ion etching, transfer of the blazed grating from a flat surface onto a convex substrate with a flexible stamp, etched into the substrate by RIE etching. and finally 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. 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 wavefront error of the diffracted beam will also be optimized. 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. Straylight measurement has been done and shows a BRDF cosq values of 10-8 sr-1 on the optical surface and 10-7 sr-1 on the structured features. This new type of non-planar reflective gratings will be the key component for future high throughput spectrographs in space missions.

Proceedings Article | 5 March 2021 Presentation

Photonic integration: from wafer level to the module

Christian Bosshard, Rolando Ferrini, Stefan Mohrdiek, Oscar Fernandez, Ton Offermans, Roger Krähenbühl, Angelique Luu-Dinh, Frederic Zanella, Guillaume Basset, Rony Jose James, Mark Fretz, Guido Spinola Durante, Amir Ghadimi

Proceedings Volume 11692, 116920Q (2021) https://doi.org/10.1117/12.2578669

KEYWORDS: Semiconducting wafers, Ultraviolet radiation, Silicon carbide, Microlens, Wafer-level optics, Wafer bonding, Transparency, Thermography, Structured optical fibers, Standards development

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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 | 29 May 2018 Presentation

Resonant screens focus on the optics of AR (Conference Presentation)

Guillaume Basset

Proceedings Volume 10676, 106760I (2018) https://doi.org/10.1117/12.2305932

KEYWORDS: Waveguides, Mixed reality, Optical properties, Transparency, Specular reflections, Diffraction gratings, Nanostructures, Volume holography, Holograms, Displays

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SPIE Journal Paper | 25 January 2018

Light refocusing with up-scalable resonant waveguide gratings in confocal prolate spheroid arrangements

Giorgio Quaranta, Guillaume Basset, Zdenek Benes, Olivier J.F. Martin, Benjamin Gallinet

JNP, Vol. 12, Issue 01, 016004, (January 2018) https://doi.org/10.1117/12.10.1117/1.JNP.12.016004

KEYWORDS: Beam steering, Waveguides, Confocal microscopy, Optical filters, Light, Cameras, Electron beams, Transparency, Mirrors, Optical design

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Proceedings Article | 31 August 2017 Presentation + Paper

Steering and filtering white light with resonant waveguide gratings

Giorgio Quaranta, Guillaume Basset, Olivier J. Martin, Benjamin Gallinet

Proceedings Volume 10354, 1035408 (2017) https://doi.org/10.1117/12.2272683

KEYWORDS: Beam steering, Waveguides, Light, Visible radiation, Thin film devices, Thin films, Optical design, Structural design, Light sources, Integrated optics, Diffraction gratings, Lenses

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Proceedings Article | 20 February 2017 Paper

Optical security features and filters using plasmonic nanostructures

Benjamin Gallinet, Fabian Lütolf, Luc Duempelmann, Guillaume Basset, Angélique Luu-Dinh, Marc Schnieper, Christian Bosshard

Proceedings Volume 10112, 101121E (2017) https://doi.org/10.1117/12.2250642

KEYWORDS: Plasmonics, Nanostructures, Aluminum, Silver, Nanolithography, Ultraviolet radiation, Sensors, Optical filters, Nanoimprint lithography, Visible radiation, Polarizers, Inkjet technology, Refractive index, Printing, Plasmons

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Proceedings Article | 8 March 2016 Presentation + Paper

Extra flat, flexible and disposable endoscope for lateral imaging

G. Basset, D. Marinov, C. Hofer, S. Cattaneo, P. Volet, B. Gallinet, M. Schnieper, R. Ferrini

Proceedings Volume 9691, 96910H (2016) https://doi.org/10.1117/12.2209627

KEYWORDS: Endoscopes, Polymers, Endoscopy, Waveguides, Polymer multimode waveguides, Coating, Reflection, Diffraction, Diffraction gratings, Image resolution, Scattering, Laser scattering

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We present an innovative disposable endoscope based on extra flat flexible polymer slabs used as multimode waveguides. The waveguides are compatible with low-cost roll-to-roll production technologies and can be easily customized by patterning, coating and printing techniques according to the specifications of the target application. In order to couple the light (i.e. the illumination beam and the imaging beam) in and out of the waveguide, diffractive subwavelength gratings are used. These nano-scale optical structures enable an efficient and controlled light trapping by total internal reflection, thus minimizing the distortion effects generated by the rough edges. Nano-patterning is obtained using established techniques (i.e. hot embossing and/or UV casting) that are compatible with industrial roll-to-roll production lines or plastic injection molding. Unique features of these innovative endoscopes are i) the achievable very thin form that can be reduced to thicknesses below 200 μm, ii) the ability to record lateral images with respect to the endoscope direction, iii) the ability to image samples (e.g. tissues, tiny objects) in direct contact with the polymer slab, with a minimum imaging distance equal to zero, and iv) the access to high volume fabrication techniques that can enable the production of low-cost disposable endoscopes. A possible device implementation is demonstrated and tested, which consists of a flat line-scanning endoscope enabling the acquisition of 1D images in monochromatic illumination and the reconstruction of 2D images by scanning. Images taken with such a disposable endoscope are discussed and the related technological constraints such as manufacturing tolerances, image distortion, scattered light and signal to noise ratio are further described. Finally, advantages and disadvantages with respect to other endoscopic techniques will be discussed, thus demonstrating the potential of this innovative approach for endoscopic applications in very confined volumes.