极化反射人工电磁表面  

Metasurface with polarized reflection

作　　者：杨富龙[1] 王晓燕[2] 任崇玉[1] 

机构地区：[1]兰州理工大学电气工程与信息工程学院,甘肃兰州730050 [2]兰州城市学院培黎工程技术学院,甘肃兰州730070

出　　处：《兰州理工大学学报》2017年第1期169-172,共4页Journal of Lanzhou University of Technology

基　　金：国家自然科学基金(61302116);甘肃省自然科学基金(148RJZA021)

摘　　要：针对以往的人工电磁表面器件只能实现一种电磁功能的现象,提出一种可以根据电磁波极化方向改变其反射方向的人工电磁表面.依据广义菲涅尔反射定律,通过选择x和y方向上的相位梯度分布,电磁波在两个方向反射角可任意调节.以具有两个参数可调的矩形三明治结构为基本单元,基于数值拟合的方法合理选择单元尺寸,搭建6周期和12周期的极化反射人工电磁表面,CST仿真表明,该人工电磁表面系统对x极化和y极化入射的电磁波其反射方向完全相反,并且其反射角可以通过改变周期进行灵活调节,仿真结果和理论分析相吻合.该方法设计的极化反射人工电磁表面器件与传统的极化反射器件相比具有设计简单、体积小、成本低等优势.Aimed at the phenomenon that previous metasurface devices is able to implement only one single electromagnetic function, a metasurface with variable reflection direction in accordance with the polarization direction of the incidence of electromagnetic wave was presented. According to the general Fresnel reflection laws, the reflection angle of electromagnetic waves can arbitrarily be adjusted by selecting the x- and y-direction phase gradient distribution. Taking a rectangular sandwich structure with two adjustable parameters as elementary unit cell, its dimensions were rationally chosen with numerical fitting method and the polarization reflection metasurface with periodicity of 6 units and 12 units was built up. CST simu- lation found that the reflection direction would be completely opposite for x- and y-direction incidence of polarization electromagnetic wave on the metasurface and the reflection angle could be flexibly adjusted by changing the periodicity. The simulation result would be consistent with that of theoretical analysis. Compared with the traditional bireflectance devices, the polarization reflection metasurface devices would have such advantage as simple design, small size and low cost.

关 键 词：人工电磁表面 极化 太赫兹 反射定律 

分 类 号：O436[机械工程—光学工程]