Towards a metasurface adapted to hyperspectral imaging applications: from subwavelength design to definition of optical properties

We numerically demonstrate the capability of a single metasurface to simultaneously separate and focus spectral features in accordance with the specifications of a pushbroom hyperspectral imager. This is achieved through the dispersion engineering of a library of two-level TiO 2 nano-elements. Somme...

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Veröffentlicht in:Optics express 2021-10, Vol.29 (21), p.32764-32777
Hauptverfasser: Billuart, Jules, Héron, Sébastien, Loiseaux, Brigitte, Amra, Claude, Lequime, Michel
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Sprache:eng
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Zusammenfassung:We numerically demonstrate the capability of a single metasurface to simultaneously separate and focus spectral features in accordance with the specifications of a pushbroom hyperspectral imager. This is achieved through the dispersion engineering of a library of two-level TiO 2 nano-elements. Sommerfeld integrals are used to confirm our numerical simulations provided by our solver based on Fourier modal method. As a proof of concept, a metasurface with a 175 µm diameter is designed to be compatible with hyperspectral imaging over a spectral range of ± 50 nm around 650 nm with a spectral resolution of 8.5 nm and a field of view of 8° around the normal incidence (angular resolution of 0.2°).
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.432969