反射式极化变焦人工电磁表面的设计  

Design of artificial electromagnetic surface with reflective polarization zoom

作　　者：杨富龙[1] 王晓燕[2] YANG Fu-long;WANG Xiao-yan(College of Electrical and Information Engineering,Lanzhou Univ.of Tech.,Lanzhou 730050,China;Belie College of Engineering and Technology,Lanzhou City University,Lanzhou 730070,China)

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》2018年第2期86-89,共4页Journal of Lanzhou University of Technology

基　　金：国家自然科学基金(61302116)

摘　　要：设计一种各向异性人工电磁表面,其反射聚焦可根据入射电磁波极化状态加以调节.依据广义菲涅耳定律,选择拥有两个自由度的金属+介质+金属的耶路撒冷十字结构,实现对垂直入射的线性极化平面电磁波全反射,并对不同极化电磁波的反射相位可以独立调控.根据经典光学成像理论,获得不同焦距不同极化态的反射电磁波相位分布,进而确定每个亚波长单元的尺寸,构造极化变焦人工电磁表面.CST微波波段仿真结果同理论分析相吻合,同时该设计方法还可推广到太赫兹波段,甚至光波波段.A kind of anisotropic metasurfaces is designed and its reflection focussing can be regulated according to polarization state of incident electromagnetic wave.Based on generalized Snell’s law,a metal+medium+metal Jerusalem cross structure is selected to realize complete reflection of normally incident linear polarization planar electromagnetic waves with independently adjustable reflection phases.According to the classical optical imaging theory,the phase distribution of reflected electromagnetic wave with different focal length and polarization state is obtained and then the size of every subwave-wave length units is determined and the metasurfaces with polarization zoom is built up.The result of CST microwave waveband simulation is in good agreement with theoretical analysis and meantime this design method can be generalized to the terahertz and even optical waveband.

关 键 词：人工电磁材料 人工电磁表面 反射定律 极化 

分 类 号：TN802[电子电信—信息与通信工程]