Switchable broadband and wide-angular terahertz asymmetric transmission based on a hybrid metal-VO2 metasurface

被引:50
作者
Dong, Xiaoxiang [1 ,2 ]
Luo, Xiaoqing [2 ]
Zhou, Yixuan [1 ]
Lu, Yuanfu [2 ,3 ]
Hu, Fangrong [4 ]
Xu, Xinlong [1 ]
Li, Guangyuan [2 ,3 ]
机构
[1] Northwest Univ, Shaanxi Joint Lab Graphene, Inst Photon & Photon Technol,Int Collaborat Ctr P, Sch Phys,State Key Lab Incubat Base Photoelect Te, Xian 710069, Peoples R China
[2] Chinese Acad Sci, Shenzhen Inst Adv Technol, CAS Key Lab Human Machine Intelligence Synergy Sy, Shenzhen 518055, Peoples R China
[3] Univ Chinese Acad Sci, Shenzhen Coll Adv Technol, Shenzhen 518055, Peoples R China
[4] Guilin Univ Elect Technol, Guangxi Key Lab Automat Detecting Technol & Instr, Guilin 541004, Peoples R China
基金
中国国家自然科学基金;
关键词
CIRCULARLY-POLARIZED WAVES; METAMATERIAL;
D O I
10.1364/OE.405173
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
We propose a switchable broadband and wide-angular terahertz asymmetric transmission based on a spiral metasurface composed of metal and VO2 hybrid structures. Results show that asymmetric transmission reaching up to 15% can be switched on or off for circularly polarized terahertz waves when the phase of VO2 transits from the insulting state to the conducting state or reversely. Strikingly, we find that relatively high asymmetric transmission above 10% can be maintained over a broad bandwidth of 2.6-4.0 THz and also over a large incident angular range of 0 degrees-45 degrees. We further discover that as the incident angle increases, the dominant chirality of the proposed metasurface with VO2 in the conducting state can shift from intrinsic to extrinsic chirality. We expect this work will advance the engineering of switchable chiral metasurfaces and promote terahertz applications. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
引用
收藏
页码:30675 / 30685
页数:11
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