亚波长光栅与法布里-珀罗滤光片集成的高性能光谱偏振分光器OA北大核心CSTPCD

Spectral polarization imaging technology is a novel optical imaging technique that not only enhances the amount of information acquired from targets,but also reduces background noise,which can capture target de-tails and detect disguised targets.This paper presents a spectro-polarimetric device by integrating subwavelength gratings with Fabry-Perot(F-P)filter,which can obtain ultra-high spectral resolution and polarization extinction ratio with high control flexibly on both spectrum and polarization.A spectro-polarimetric filter(SPF)has been designed to obtain 4 spectral channels of stokes parameters simultaneously.Simulation results show that it has a spectral resolution(SR,λ/∆λ)of 217 and a polarization extinction ratio(PER)of 106.The polarization extinc-tion ratio of subwavelength grating is measured to be over 500 PER with 90%transmission efficiency.The spec-tral resolution of all-dielectric F-P filter is measured to be 30 with 60%transmission efficiency in the long wave in-frared band.The designed method is universal and can be used in a wide range of wavelength bands such as visi-ble,infrared,and even terahertz.It has great potential applications in fields such as micro-polarization spectrome-ters and full-stokes polarization detection,benefiting from these advantages.