Terahertz metasurface polarization detector based on vortex mode recognition and application of terahertz metasurface polarization detector

The invention discloses a terahertz metasurface polarization detector based on vortex mode recognition, and belongs to the technical field of novel artificial electromagnetic materials and terahertz science. A spin decoupling all-dielectric metasurface is adopted, and a pair of vortex beams with opposite topological charges is generated based on independent phase modulation under left-handed and right-handed circular polarization incidence. Through the mode analysis of the transmission vortex field, the polarization parameter describing the incident polarization state can be completely obtained. The polarization state of the incident wave is reconstructed by using polarization ellipse, Poincare sphere and full Stokes parameters. The terahertz metasurface polarization detector has significant application potential in ultra-compact polarization detection devices, polarization imaging and related fields. 本发明公开了一种基于涡旋模式识别的太赫兹超表面偏振探测器，属于新型人工电磁材料和太赫兹科学技术领域。本发明采用一种自旋解耦的全介质超表面，基于对左旋和右旋圆偏振入射下的独立相位调制，产生一对具有相反拓扑荷的涡旋光束。通