Real-Time Angular Sensitivity Compensation of Guided-Mode Resonance Filter

Guided-mode resonant filters (GMRFs) are promising narrowband filters with high peak efficiency, but their practical applications have been restricted by their natural high angular sensitivity. We investigated the influence of incident angle and azimuthal angle on the spectral response of GMRF, and found that the resonant peaks are mainly influenced by the incident angle. A polymer-dispersed liquid crystal layer was introduced to compensate the shift of resonant wavelength through applying proper voltage in real time, and numerical results show that a large angular compensation range of about ±4.2° can be obtained while maintaining high performance of the spectral response.