A novel method based on polarization beam splitting and focusing for Full Stokes detection of dielectric metasurfaces

At present, most polarization detectors are based on polarization filtering methods. The principle is that different detection areas only transmit a certain component of polarized light. Stokes parameter reconstruction is achieved by obtaining four or six polarized components of incident light. However, the sensor of this polarization detector can only receive 50% of the incident light energy. To improve the energy utilization of the polarization detector. Based on the flexible modulation capability of the dielectric metasurfaces to phase. We designed a metasurface that can separate incident light by polarization, and then focus the polarization components in different ways. The light energy received by the sensor is only limited by the transmittance of the metasurfaces. The polarization detection metasurface is composed of three metalenses. The numerical simulation result is that the error of Stokes reconstruction parameters is less than 0.03, and the transmission efficiency is higher than 60%. This detection metasurface improves the energy efficiency of traditional polarization detectors. This kind of polarization detection metasurface has great significance to the development of ultra-miniaturization polarization detection systems.