基于电磁超表面的太赫兹线极化转换器

Terahertz linear polarization converter based on electromagnetic metasurface

摘要:

研究基于电磁超表面的太赫兹波束极化调控技术，即采用金属-介质-金属的三层结构设计了一种反射式太赫兹波90o线极化转换器，并分别采用数值仿真和实验测试方法表征其极化转换特性。结果表明，该反射式超表面可以在工作频率(0.5 THz)达到高效的线极化转换(高于75%)，且具有宽带特性(在0.35~0.65 THz极化转换效率超过50%)。此外，采用的超薄玻璃介质衬底使得超表面极化转换器具有厚度小、质量轻和耐热性好等优异的综合性能。

Abstract:

The terahertz polarization manipulation technology based on electromagnetic metasurface is studied. Specifically, a reflective-type terahertz 90o linear polarization converter is designed by using the metal-dielectric-metal sandwiched structure, and the polarization conversion characteristics are investigated both numerically and experimentally. It is shown that the reflective-type metasurface designed in this work achieves a high polarization conversion efficiency(above 75%) at the operating frequency of 0.5 THz as well as a broad working band(the polarization conversion efficiency is more than 50% over the frequency range of 0.35-0.65 THz). In addition, the ultrathin glass substrate produces the excellent overall performances of the metasurface linear polarization converter, including small thickness, light weight, and good heat resistance.