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.
|Title of host publication||Space Telescopes and Instrumentation 2022|
|Subtitle of host publication||Optical, Infrared, and Millimeter Wave|
|Editors||Laura E. Coyle, Shuji Matsuura, Marshall D. Perrin|
|Number of pages||9|
|Publication status||Published - 2022|
|Event||SPIE Astronomical Telescopes + Instrumentation 2022 - Montréal, Canada|
Duration: 17 Jul 2022 → 22 Jul 2022
|Name||Proceedings of SPIE - The International Society for Optical Engineering|
|Conference||SPIE Astronomical Telescopes + Instrumentation 2022|
|Period||17/07/22 → 22/07/22|
Bibliographical noteGreen 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
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