可重构太赫兹石墨烯极化转换超表面  

Reconfigurable Terahertz Graphene Polarization Conversion Metasurface

作　　者：司黎明[1] 汤鹏程 吕昕[1] SI Liming;TANG Pengcheng;LYU Xin(School of Integrated Circuits and Electronics,Beijing Institute of Technology,Beijing Key Laboratory of Millimeter Wave and Terahertz Technology,Beijing 100081,China)

机构地区：[1]北京理工大学集成电路与电子学院/毫米波与太赫兹技术北京市重点实验室,北京100081

出　　处：《无线电通信技术》2022年第2期233-240,共8页Radio Communications Technology

基　　金：国家重点基础研究项目(2019.JCJQ.349);国家重点研发计划(2018YFF0212103);国家自然科学基金(61527805);高等学校学科科研创新引智计划项目(B14010);北京理工大学国际合作项目(BITBLR2020014)。

摘　　要：提出了一款基于石墨烯的太赫兹超表面单元,该单元能够对圆极化入射波起到极化转换的作用。通过调节石墨烯的化学势能,超表面单元的反射特性会发生改变。在此基础上,根据几何相位以及异常反射原理,利用超表面单元的相位调制特性,构建了3组不同相位梯度的超表面,并对不同化学势能条件下的近场特性进行了电磁仿真研究。更进一步,又利用超表面单元构成了1 bit编码超表面。改变石墨烯的化学势能,可以对其散射远场方向图起到调控作用。该款基于石墨烯的太赫兹超表面单元为灵活调控太赫兹波提供了新的思路,未来有望应用到太赫兹频段上可重构智能超表面的构建当中。A terahertz metasurface unit based on graphene is proposed,which can realize circular polarization conversion.By adjus⁃ting the chemical potential energy of graphene,the reflection characteristics of the metasurface unit will change.Furthermore,based on the principle of geometric phase and anomalous reflection,three groups of metasurfaces with different phase gradients are constructed.Their near⁃field characteristics with different chemical potential energy are studied by electromagnetic simulations.What’s more,a 1⁃bit coded metasurface is constructed.By changing the chemical potential energy of graphene,the far⁃field pattern could be regulated.This graphene terahertz metamaterial unit provides a new idea for flexible regulation of terahertz waves,and is expected to be applied to the construction of reconfigurable intelligent surface in terahertz band in the future.

关 键 词：太赫兹 超表面 石墨烯 可重构 异常反射 

分 类 号：TP391.4[自动化与计算机技术—计算机应用技术]