Terahertz wavefront shaping with multi-channel polarization conversion based on all-dielectric metasurface

查看全文 作　　者：JIE [1]LI;CHENGLONG [1]ZHENG;JITAO [1]LI;GUOCUI [2,3]WANG;JINGYU [2]LIU;ZHEN [1]YUE;XUANRUO [1]HAO;YUE [1]YANG;FUYU [4]LI;TINGTING [4]TANG;YATING [1]ZHANG;YAN [2]ZHANG;JIANQUAN [1]YAO

机构地区：[1]Key Laboratory of Opto-Electronics Information Technology(Tianjin University),Ministry of Education,School of Precision Instruments and Opto-Electronics Engineering,Tianjin University,Tianjin 300072,China;[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,Beijing 100048,China;[3]Beijing Engineering Research Center for Mixed Reality and Advanced Display,School of Optics and Photonics,Beijing Institute of Technology,Beijing 100081,China;[4]Information Materials and Device Applications Key Laboratory of Sichuan Provincial Universities,Chengdu University of Information Technology,Chengdu 610225,China

出　　处：《Photonics Research》索引2021年第9卷第10期,共9页

基　　金：National Natural Science Foundation of China(61675147,61735010,91838301);National Key Research and Development Program of China(2017YFA0700202);Basic Research Program of Shenzhen(JCYJ20170412154447469). 摘　　要：Polarization manipulation of electromagnetic wave or polarization multiplexed beam shaping based on metasurfaces has been reported in various frequency bands.However,it is difficult to shape the beam with multi-channel polarization conversion in a single metasurface.Here,we propose a new method for terahertz wavefront shaping with multi-channel polarization conversion via all-silicon metasurface,which is based on the linear shape birefringence effect in spatially interleaved anisotropic meta-atoms.By superimposing the eigen-and non-eigen-polarization responses of the two kinds of meta-atoms,we demonstrate the possibility for high-efficiency evolution of several typical polarization states with two independent channels for linearly polarized waves.The measured polarization conversion efficiency is higher than 70%in the range of 0.9–1.3 THz,with a peak value of 89.2%at 1.1 THz.In addition,when more other polarization states are incident,combined with the integration of sub-arrays,we can get more channels for both polarization conversion and beam shaping.Simulated and experimental results verify the feasibility of this method.The proposed method provides a new idea for the design of terahertz multi-functional metadevices. 关键词：surface. method. DIELECTRIC

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Terahertz wavefront shaping with multi-channel polarization conversion based on all-dielectric metasurface

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