Graphene-enabled electrically controlled terahertz meta-lens  

作　　者：WEIGUANG LIU BIN HU ZONGDUO HUANG HONGYU GUAN HETING LI XINKE WANG YAN ZHANG HONGXING YIN XIAOLU XIONG JUAN LIU YONGTIAN WANG 

机构地区：[1]Beijing Engineering Research Center for Mixed Reality and Advanced Display, School of Optics and Photonics, Beijing Institute of Technology [2]Beijing Key Laboratory for Metamaterials and Devices, Key Laboratory of Terahertz Optoelectronics, Ministry of Education,and Beijing Advanced Innovation Center for Imaging Technology, Department of Physics, Capital Normal University [3]Micro and Nanotechnology Research Center, School of Physics, Beijing Institute of Technology

出　　处：《Photonics Research》2018年第7期703-708,共6页光子学研究（英文版）

基　　金：National Key R&D Program of China(2017YFB1002900);973 Program of China(2013CBA01702);National Natural Science Foundation of China(NSFC)(11404224,1174243,11774246,61405012,61420106014);Excellent Young Scholars Research Fund of Beijing Institute of Technology(BIT)

摘　　要：Metasurfaces have become a new photonic structure for providing potential applications to develop integrated devices with small thickness, because they can introduce an abrupt phase change by arrays of scatterers. To be applied more widely, active metasurface devices are highly desired. Here, a tunable terahertz meta-lens whose focal length is able to be electrically tuned by ～4.45λ is demonstrated experimentally. The lens consists of a metallic metasurface and a monolayer graphene. Due to the dependence of the abrupt phase change of the metasurface on the graphene chemical potential, which can be modulated using an applied gate voltage, the focal length is changed from 10.46 to 12.24 mm when the gate voltage increases from 0 to 2.0 V. Experimental results are in good agreement with the theoretical hypothesis. This type of electrically controlled meta-lens could widen the application of terahertz technology.Metasurfaces have become a new photonic structure for providing potential applications to develop integrated devices with small thickness, because they can introduce an abrupt phase change by arrays of scatterers. To be applied more widely, active metasurface devices are highly desired. Here, a tunable terahertz meta-lens whose focal length is able to be electrically tuned by ～4.45λ is demonstrated experimentally. The lens consists of a metallic metasurface and a monolayer graphene. Due to the dependence of the abrupt phase change of the metasurface on the graphene chemical potential, which can be modulated using an applied gate voltage, the focal length is changed from 10.46 to 12.24 mm when the gate voltage increases from 0 to 2.0 V. Experimental results are in good agreement with the theoretical hypothesis. This type of electrically controlled meta-lens could widen the application of terahertz technology.

关 键 词：散射体阵列 光子结构 通讯技术 发展现状 

分 类 号：TM914.41[电气工程—电力电子与电力传动] TN92[电子电信—通信与信息系统]