宽带高效反射电磁波极化调控超表面的实验研究

电磁超表面具有传统材料无法实现的新奇电磁特性. 利用超表面来调控电磁波极化状态成为一个热门的研究领域. 本文提出了一种由金属贴片组成的各向异性超表面来实现对水平极化波和垂直极化波的正交极化调控. 数值仿真结果显示所设计的超表面在8.16～15.32 GHz内可以将水平极化或垂直极化入射的电磁波经过反射后分别转换成其正交分量，极化转换率和相对带宽分别达到了95%和60%. 实验结果与数值仿真结果吻合较好. 通过理论计算和表面电流分布详细阐述了极化调控的物理机理.

Experimental demonstration of broadband and high-efficiency reflection polarization conversion metasurface

Metasurface has opened an effective way to handle the polarization states of electromagnetic waves since their intrinsic parameters could be flexibly tailored. In this paper， a simple anisotropic metasurface is presented to realize the polarization manipulation of linearly polarized wave with high conversion efficiency in a wide frequency band. The presented simple metasurface is able to convert the linearly polarized incident wave into its orthogonal polarized reflected wave at the frequency range of 8.16～15.32 GHz. Both the simulated and experimental results demonstrate that the bandwidths of the polarization conversion ratio reach more than 90% with the relative bandwidths of 60%. The conversion mechanism of the polarization is discussed with the theoretical calculations and surface current distributions.