Abstract

Conventional transmission-type color filter metasurfaces have not considered reflection that might cause image quality degradation of practical CMOS image sensors including flare effect. Here, we propose RGB color-optimized tapered hyperbolic metamaterial cavities as absorptive color filters. Since multiple geometry parameters need to be considered for optimization, we design our metasurfaces based on particle swarm optimization through FDTD simulations. Consequently, less than 20 % reflection is achieved over visible wavelength and transmission from each RGB-pixel covers about 78% of sRGB region.

© 2020 The Author(s)