Print Email Facebook Twitter Developing compact and innovative dual-band thermal imagers using multi-layer diffractive optical elements Title Developing compact and innovative dual-band thermal imagers using multi-layer diffractive optical elements Author Laborde, Victor (Université de Liège) Loicq, J.J.D. (TU Delft Spaceborne Instrumentation) Habraken, Serge (Université de Liège) Contributor Coyle, Laura E. (editor) Matsuura, Shuji (editor) Perrin, Marshall D. (editor) Date 2022 Abstract Infrared (IR) remote sensing offers a huge range of applications, mostly addressing make-or-break issues of our century (wildfires, irrigation monitoring, etc.). Multispectral spaceborne instruments require bulky optical systems designed for a specific scientific goal and have very low revisit time. Thereby, constellations of small satellites embarking compact dual-band IR imagers are very promising solutions. We study a dual-band IR diffractive element called multilayer diffractive optical elements (MLDOE). It replaces classical diffractive lenses (DOEs) that cannot operate simultaneously in two distinct wavebands. An MLDOE design is studied using the rigorous finite difference time domain (FDTD) method. Its performance at the ”best” focal plane is deduced using free-space Fourier optics wave propagation. The presented MLDOE design has over 80% Strehl ratio in both bands, outperforming classical DOEs. Its chromatic focal shift has a negative variation, in opposition to refractive lenses, allowing efficient and compact dual-band hybrid lenses. To reference this document use: http://resolver.tudelft.nl/uuid:03b85045-7afe-4ebd-b3a5-45100ff213d2 DOI https://doi.org/10.1117/12.2630169 Embargo date 2023-07-01 ISBN 9781510653412 Source Space Telescopes and Instrumentation 2022: Optical, Infrared, and Millimeter Wave Event SPIE Astronomical Telescopes + Instrumentation 2022, 2022-07-17 → 2022-07-22, Montréal, Canada Series Proceedings of SPIE - The International Society for Optical Engineering, 0277-786X, 12180 Bibliographical note Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public. Part of collection Institutional Repository Document type conference paper Rights © 2022 Victor Laborde, J.J.D. Loicq, Serge Habraken Files PDF 121805Q.pdf 2.09 MB Close viewer /islandora/object/uuid:03b85045-7afe-4ebd-b3a5-45100ff213d2/datastream/OBJ/view