All-dielectric metasurfaces capable of polarization detection and vortex beams generation

Abstract

Metasurfaces are the ultrathin version of metamaterials with the flexible ability to control and identify polarization states. Here, an all-dielectric metasurface based on T i O 2 is demonstrated, combining the principle of holographic imaging and using image intensity as a key parameter, vividly realizing one-to-one mapping of linear polarization states with far-field images. In addition, combining the focusing with a polarization multiplexing principle to distinguish the spin direction of circular polarization light and generate the high-purity vortex beams with energy offset, the proposed capabilities have potential applications in the fields of polarization detection, optical beam research, and communication.