Phase Modulation Mechanism and Research Progress of Multifunctional Metasurfaces

Here, we begin with analyzing the principle of phase modulation mechanism of metasurface, and then discuss how to utilize multiple degrees of freedom to achieve multifunctional optical response. For a proof of concept, we design several metasurfaces composed of amorphous silicon (a-Si) nanorods to demonstrate the multichannel control of light with different phase mechanisms. This study provides theoretical support for flexible design of metasurfaces, and introduces and gives a summary of the research progress of multifunctional meta-devices.