Angle tolerant transmissive color filters exploiting metasurface incorporating hydrogenated amorphous silicon nanopillars
Angle tolerant transmissive subtractive color filters incorporating a metasurface exploiting hydrogenated amorphous silicon (a-Si:H) nanopillars (NPs) on a glass substrate, were proposed and demonstrated. The achieved transmission efficiency ranged from 75% to 95% at off-resonance wavelengths. For NP resonator, electric and magnetic field distributions in conjunction with absorption cross-sections were investigated to confirm resonant transmission dip which is primarily governed by the absorption resulting from simultaneous excitation of magnetic and electric dipoles via Mie scattering. The proposed devices exhibit higher angular tolerance and lower crosstalk for the absorption spectra and therefore be applicable with photodetectors, image sensors, and imaging/display devices.
KOIRALA ISHWOR,Park Chul-Soon,Lee Sang-Shin,Choi Duk-Yong. Angle tolerant transmissive color filters exploiting metasurface incorporating hydrogenated amorphous silicon nanopillars[J].Chinese Optics Letters,2019,17(8):08.