Highly Integrated Multifunctional Coding Metasurface in Full-Space Based on Independent Control of Transmission and Reflection

Multifunctional metasurfaces working in the transmission-reflection (TR) state have attracted more attention because the TR metasurface integrating more functionalities saves the occupied space and further expands the control abilities of electromagnetic waves in full space. Herein, a switchable TR coding metasurface is proposed that can not only dynamically regulate the TR states of the x/y polarizations but also realize the independent phase control of the transmitted and reflected x/y polarizations. Subsequently, based on different polarizations control, as the first proof-of-concept demonstration, a multifunctional coding metasurface, including the dual-beam deflection, beam focusing, and vortex beam generation, is demonstrated numerically, theoretically, and experimentally. Meanwhile, as the second proof-of-concept demonstration, a switchable multi-beam metasurface, including dynamic TR amplitude coding, phase coding, and beam-scanning for both x and y polarizations in full space, is verified numerically and experimentally. Therefore, the proposed highly integrated multifunctional coding metasurface provides a promising way to integrate multifunction and enables full-space wireless communication.