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Proceedings Paper

Pixelated filters for spatial imaging
Author(s): Karine Mathieu; Michel Lequime; Julien Lumeau; Laetitia Abel-Tiberini; Isabelle Savin De Larclause; Jacques Berthon
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Paper Abstract

Small satellites are often used by spatial agencies to meet scientific spatial mission requirements. Their payloads are composed of various instruments collecting an increasing amount of data, as well as respecting the growing constraints relative to volume and mass; So small-sized integrated camera have taken a favored place among these instruments. To ensure scene specific color information sensing, pixelated filters seem to be more attractive than filter wheels. The work presented here, in collaboration with Institut Fresnel, deals with the manufacturing of this kind of component, based on thin film technologies and photolithography processes. CCD detectors with a pixel pitch about 30 μm were considered. In the configuration where the matrix filters are positioned the closest to the detector, the matrix filters are composed of 2x2 macro pixels (e.g. 4 filters). These 4 filters have a bandwidth about 40 nm and are respectively centered at 550, 700, 770 and 840 nm with a specific rejection rate defined on the visible spectral range [500 – 900 nm]. After an intense design step, 4 thin-film structures have been elaborated with a maximum thickness of 5 μm. A run of tests has allowed us to choose the optimal micro-structuration parameters. The 100x100 matrix filters prototypes have been successfully manufactured with lift-off and ion assisted deposition processes. High spatial and spectral characterization, with a dedicated metrology bench, showed that initial specifications and simulations were globally met. These excellent performances knock down the technological barriers for high-end integrated specific multi spectral imaging.

Paper Details

Date Published: 12 October 2015
PDF: 7 pages
Proc. SPIE 9633, Optifab 2015, 963321 (12 October 2015); doi: 10.1117/12.2195689
Show Author Affiliations
Karine Mathieu, Ctr. National d'Études Spatiales (France)
Michel Lequime, Aix-Marseille Univ., CNRS, Institut Fresnel (France)
Julien Lumeau, Aix-Marseille Univ., CNRS, Institut Fresnel (France)
Laetitia Abel-Tiberini, Aix-Marseille Univ., CNRS, Institut Fresnel (France)
Isabelle Savin De Larclause, Ctr. National d'Études Spatiales (France)
Jacques Berthon, Ctr. National d'Études Spatiales (France)

Published in SPIE Proceedings Vol. 9633:
Optifab 2015
Julie L. Bentley; Sebastian Stoebenau, Editor(s)

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