Wide-angle transmissive filter based on a guided-mode resonant grating.
A wide-angle color filter for TE-polarization is proposed based on a guided-mode resonant grating selectively coated with a metal film. The effects of the structure parameters to the resonant transmission characteristics are discussed by the rigorous coupled-wave analysis. Its optimal structure was given for a green color filter with a peak transmission of 77.6%, a full width at half-maximum (FWHM) of ~120 nm, and a good angular tolerance up to ±40°. Compared to the similar structure with a nonresonant dielectric grating, it decreases the FWHM effectively for the resonance induced by the guided-mode resonant grating. The numerical results indicate that the designed structure has a good wide-angle transmission performance.
Institute of Information Optical Engineering, Soochow University, Suzhou 215006, China. yanye@suda.edu.cn
Yan
Y
Ye
Renjin
R
Shao
Yun
Y
Zhou
Linsen
L
Chen