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

Color filter arrays based on dielectric metasurface elements