Dr. Rémi Rivière Profile

Dr. Rémi Rivière

Optical performance engineer at Airbus Defence and Space

SPIE Involvement:

Author

Area of Expertise:

straylight , space optics , spectroscopy , laser , photolithography , front-end of line

Websites:

Company Website

2006: Master in Physics Engineering, University of Toulouse, France
2011: PhD in Quantum Optics, Max Planck Institute for Quantum Optics, Munich, Germany
2012-2016: Photolithography Engineer, GlobalFoundries, Dresden, Germany
Since September 2016: Optical Performance Engineer, Airbus Defence and Space, Munich, Germany
Current role: Optical System Architect, focusing on calibration and performance.

Proceedings Article | 12 July 2023 Open Access

METimage – PFM status report

Oswald Wallner, Klaus Ergenzinger, Rémi Rivière, Frank Schmülling

Proceedings Volume 12777, 127771T (2023) https://doi.org/10.1117/12.2689939

KEYWORDS: Optical fabrication, Equipment, Calibration, Integrated optics, Cryogenics, Head, Satellites, Engineering, Instrument modeling, Thermography

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Proceedings Article | 12 July 2023 Open Access

Results of the METimage HgCdTe flight photodetector test campaign

Rémi Rivière, Klaus-Werner Kruse, Henrique Candeias, Laurent Vial, Céline Riuné, Michael Skegg, Olivier Saint-Pé

Proceedings Volume 12777, 127773R (2023) https://doi.org/10.1117/12.2690563

KEYWORDS: Compliance, Photodetectors, Mercury cadmium telluride, Surface plasmons, Performance modeling, Astronomical imaging, Signal detection, Short wave infrared radiation, Equipment, Interference (communication)

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The METimage instrument is an Airbus-primed passive superspectral imaging radiometer measuring thermal radiance emitted by the Earth and solar backscattered radiation in 20 spectral channels from 0.44µm to 13.35µm. The instrument achieves the entire Earth coverage at a low-Earth polar-orbit on daily basis by constantly scanning with spatial resolution of 500m at nadir and constant spatial sampling angle (SSA) across a 2670km swath. In the thermal domain, the most crucial part of the system is the pair of cryogenically-cooled HgCdTe (MCT) photodetectors intended for thermal-domain SMWIR and LVWIR, the development and manufacturing of which was contracted to LYNRED, who have successfully delivered the flight models to Airbus. In this work, the results of the Airbus-hosted flight detection-chain level test campaign in nominal vacuum and cryogenic environment are presented. Their system impacts are evaluated to conclude the expected full flight-worthiness of both delivered photodetectors into the METimage optical payload. First, both dark currents and offsets are characterized: both parameter noise levels quantitatively outperform their predicted values, minimizing their impact on the system signal-to-noise ratio (SNR). Then the response linearity of both photodetectors over the required thermal radiance ranges has been measured and has shown better performances than predicted by design over the setup-accessible solar and 185K to 280K thermal radiance ranges. Finally, the random telegraph signal (RTS) signature of both photodetectors is thoroughly characterized based on a novel sharp-edge detection method in conditions mimicking in-orbit operation: after periodic cooldowns and at stable nominal temperatures. Based on these measurements, the sub-pixel selection map (SPSM) is generated, enabling to deselect image elements that are deemed to degrade overall performance from a system perspective. Thanks to a demanding flight model selection procedure applied by LYNRED, the RTS test results of the sorted out devices are significantly better than expected, hence ensuring compliance for system SNR and homogeneity. Full flight worthiness is therefore confirmed and final integration of both photodetectors in the first METimage flight instrument optical system is currently ongoing. Additional presentation content can be accessed on the supplemental content page.

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Proceedings Article | 11 June 2021 Open Access

Experimental validation of a 2D-slit homogenizer for space based imaging spectrometers

Timon Hummel, Claude Coatantiec, Xavier Gnata, Tobias Lamour, Rémi Rivière, Christian Meister, Jasper Krauser, Dennis Weise, Mark Wenig

Proceedings Volume 11852, 118520L (2021) https://doi.org/10.1117/12.2599167

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The analysis of recent Earth observation spectrometer missions revealed the impact of spatially heterogeneous Earth radiance scenes on the spectral accuracy of the instruments. One of the most critical observations is the distortion of the instrument spectral response function (ISRF) induced by radiometric contrast in the Earth radiance scene. In order to meet the high precision and accuracy of quantifying the spatial distribution of the atmospheric composition, stringent requirements on the ISRF knowledge are defined such as shape stability, centroid position of the spectral channel centre and the Full Width at Half Maximum (FWHM). In the framework of the CO2M A/B1 study, Airbus investigated a new slit concept called 2D-slit homogenizer (2DSH) for the mitigation of spatially non-uniform scenes. This is done by replacing the classical spectrometer slit with non-circular core multimode fibres, which scramble the light in along-track (ALT) and across-track (ACT) direction and hence average the contrast of the Earth scene in both dimensions. The final 2DSH will be made of several adjoined fibres, assembled in a bundle. A single fibre core dimension defines the spectral extent of the slit (ALT) and the minimum achievable spatial sample (ACT). Consequently, the full swath width covered by the instrument is given by the total size of the fibre bundle in ACT. Here, we present an experimental validation of the 2DSH in terms of scrambling efficiency and radiometry. In order to probe the fibre characteristics for non-uniform scenes, we designed and constructed a setup which allows us to track and tune multiple high contrast scene cases as a fibre input facet illumination. The scrambling efficiency performance of the fibre is assessed by measuring the near- and far-field intensity distribution of light transmitted through the fibre for different scene cases. With the acquired data, we propagate the fibre output through the subsequent spectrograph by simulation and thereby translate the measured near- and far-field distributions in ISRF errors. In particular we quantify the ISRF shape, centroid and FWHM for different Earth scenes. Furthermore, we analyze the impact of focal ratio degradation in terms of radiometric losses and compare the results in the NIR and SWIR wavelength for different stress cases on the fibre.

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Proceedings Article | 11 June 2021 Open Access

Space optics instrument optimization and characterization with artificial intelligence

Mathieu Ferrato, Rémi Rivière, Henrique Candeias, Sebastian Schmid, Jasper Krauser

Proceedings Volume 11852, 1185265 (2021) https://doi.org/10.1117/12.2600054

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Proceedings Article | 11 June 2021 Open Access

Space spectrograph design to calibration

Rémi Rivière, Xavier Gnata, Claude Coatantiec, Sebastian Schmid, Flavien Albano, Toby Bi, Pascal Del’haye, Tatiana Burikova, Davide Sacchetto, Anton Stroganov, Michael Geiselmann, Stefan Paus

Proceedings Volume 11852, 118524A (2021) https://doi.org/10.1117/12.2599649

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Proceedings Article | 12 July 2019 Open Access

In-field and Out-of-field stray light analysis for the COPERNICUS Sentinel 4 instrument

S. Grabarnik, G. Bazalgette Courrèges-Lacoste, C. Pachot, L. Gambicorti, R. Rivière, Stefan Riedl

Proceedings Volume 11180, 111802Q (2019) https://doi.org/10.1117/12.2536017

KEYWORDS: Stray light, Zemax, Spectroscopy, Near infrared, Telescopes, Device simulation, Geometrical optics, Data modeling, Stray light analysis, Sensors

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Proceedings Article | 8 October 2014 Paper

Laser-written binary OMOG photomasks for high-volume non-critical 193-nm photolithographic layers

Rémi Rivière, Selvi Gopalakrishnan, Martin Mazur, Nevzat Öner, Sven Mühle, Rolf Seltmann

Proceedings Volume 9235, 92350S (2014) https://doi.org/10.1117/12.2059622

KEYWORDS: Photomasks, Reticles, Optical proximity correction, Semiconducting wafers, Binary data, Chromium, Critical dimension metrology, Photoresist materials, Opacity, Front end of line

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Proceedings Article | 9 September 2013 Paper

Alternative material to mitigate chrome degradation on high volume ArF layers

Guoxiang Ning, Selvi Gopalakrishnan, Thomas Thamm, Nikolay Oleynik, Paul Ackmann, Remi Riviere, Stephanie Maelzer, Yee Mei Foong

Proceedings Volume 8880, 88801P (2013) https://doi.org/10.1117/12.2025466

KEYWORDS: Binary data, Semiconducting wafers, Reticles, Optical proximity correction, Photomasks, Critical dimension metrology, 3D modeling, Metals, Data modeling, Electron beam melting

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