Angular-dependent circular dichroism of Tai Chi chiral metamaterials in terahertz region

被引：5

作者：

Dong, Xiaoxiang ^{[1
]}

Liu, Changji ^{[1
]}

Huang, Yuanyuan ^{[1
]}

Hu, Fangrong ^{[2
]}

E, Yiwen ^{[3
]}

Jin, Yanping ^{[1
]}

Zhou, Yixuan ^{[1
]}

Xu, Xunlong ^{[1
,2
]}

机构：

[1] Northwest Univ, Sch Phys,Shaanxi Joint Lab Graphene, Inst Photon & Photon Technol,State Key Lab Incuba, Int Collaborat Ctr Photoelect Technol & Nano Func, Xian 710069, Peoples R China

[2] Guilin Univ Elect Technol, Guangxi Key Lab Automat Detecting Technol & Instr, Guilin 541004, Peoples R China

[3] Univ Rochester, Inst Opt, Rochester, NY 14627 USA

来源：

APPLIED OPTICS | 2020年 / 59卷 / 12期

基金：

中国国家自然科学基金;

关键词：

ABSORPTION;

D O I：

10.1364/AO.387150

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Chirality has received wide attention due to its promising applications in biopharmaceuticals, chemical detection, and polarized optoelectronic devices. Herein, metamaterials with layered Tai Chi patterns are proposed to get strong and tunable chirality. Based on the surface current distribution analysis, a coupling model considering both the magnetic and electric dipoles in the upper and bottom metallic structures is proposed to understand the circular dichroism. Accordingly, both an external chiral modulation by changing the incident angle and an internal chiral modulation by changing the twist angle are achieved. Incident-angle-dependent circular dichroism modulation exhibits a range of 0.44-0.62 and the twist-angle-dependent modulation range is -0.6-0.42, where the negative value means the polarity of the circular dichroism can also be tuned. This work deepens the understanding of angular-dependent chirality in metamaterials and expands the potential for terahertz polarization optoelectronic applications. (C) 2020 Optical Society of America

引用

页码：3686 / 3691

页数：6

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