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Color filter arrays based on dielectric metasurface elements

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Author: Berzins, J. · Silvestri, F. · Gerini, G. · Setzpfandt, F. · Pertsch, T. · Bäumer, S.M.B.
Type:article
Date:2018
Publisher: SPIE
Source:Metamaterials XI, Strassbourg, France, 23-26 April 2018, Zayats, A.V.Boardman, A.D.MacDonald, K.F., 10671
series:
Proceedings of SPIE - The International Society for Optical Engineering
Identifier: 842143
ISBN: 9781510618688
Article number: 106711F
Keywords: Electronics · CMY · RGB · Cameras · Hyperspectral imaging · Light transmission · Metamaterials · Silicon · Wave filters · Color filter arrays · Dependent scatterings · Hyper-spectral cameras · Metasurfaces · Nanodisks · Nanostructured surface · Transmission spectrums · High Tech Systems & Materials · Industrial Innovation

Abstract

Digital imaging has been steadily improving over the past decades and we are moving towards a wide use of multi- and hyperspectral cameras. A key component of such imaging systems are color filter arrays, which define the spectrum of light detected by each camera pixel. Hence, it is essential to develop a variable, robust and scalable way for controlling the transmission of light. Nanostructured surfaces, also known as metasurfaces, offer a promising solution as their transmission spectra can be controlled by shaping the wavelength-dependent scattering properties of their constituting elements. Here we present, metasurfaces based on silicon nanodisks, which provide filter functions with amplitudes reaching 70-90% of transmission, and well suitable for RGB and CMY color filter arrays, the initial stage towards the further development of hyperspectral filters. We suggest and discuss possible ways to expand the color gamut and improve the color values of such optical filters.