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

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 details 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 extinction ratio of subwavelength grating is measured to be over 500 PER with 90% transmission efficiency. The spectral resolution of all-dielectric F-P filter is measured to be 30 with 60% transmission efficiency in the long wave infrared band. The designed method is universal and can be used in a wide range of wavelength bands such as visible‚infrared‚and even terahertz. It has great potential applications in fields such as micro-polarization spectrometers and full-stokes polarization detection‚benefiting from these advantages.