Integrated manipulation for surface and spatial wave based on a programmable topological metasurface

A programmable topological metasurface is presented to realize flexible electromagnetic manipulation of surface waves and spatial waves. Six PIN diodes are loaded in each hexagonal metasurface element and two working modes with four diodes’ states can be quickly changed with the help of an FPGA. Under the excitation of a surface or spatial wave, the programmable metasurface can regulate the formation of different topological guided wave paths of surface waves and spatial waves with different scattering beam angles. The good performance of the presented metasurface has been verified by numerical simulation and experimental results, which has great potential in multifunctional metadevices.