Metal-graphene hybrid active chiral metasurfaces for dynamic terahertz wavefront modulation and near field imaging

被引：123

作者：

Li, Jie ^{[1
]}

Li, Jitao ^{[1
]}

Yang, Yue ^{[1
]}

Li, Jining ^{[1
]}

Zhang, Yating ^{[1
]}

Wu, Liang ^{[1
]}

Zhang, Zhang ^{[1
]}

Yang, Maosheng ^{[4
]}

Zheng, Chenglong ^{[1
]}

Li, Jiahui ^{[1
]}

Huang, Jin ^{[1
]}

Li, Fuyu ^{[3
]}

Tang, Tingting ^{[3
]}

Dai, Haitao ^{[2
]}

Yao, Jianquan ^{[1
]}

机构：

[1] Tianjin Univ, Sch Precis Instruments & Optoelect Engn, Minist Educ, Key Lab Optoelect Informat Technol, Tianjin 300072, Peoples R China

[2] Tianjin Univ, Sch Sci, Tianjin Key Lab Low Dimens Mat Phys & Preparing T, Tianjin 300072, Peoples R China

[3] Chengdu Univ Informat Technol, Informat Mat & Device Applicat Key Lab Sichuan Pr, Chengdu 610225, Peoples R China

[4] Jiangsu Univ, Sch Mech Engn, Zhenjiang 225009, Jiangsu, Peoples R China

来源：

CARBON | 2020年 / 163卷

基金：

中国国家自然科学基金;

关键词：

PLASMONIC NANOSTRUCTURES; ASYMMETRIC TRANSMISSION; STRAIN SENSORS;

D O I：

10.1016/j.carbon.2020.03.019

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Chiral metasurfaces can achieve giant chiral optical responses and have been expanded from the optical band to other electromagnetic bands. Here, we propose a new method for dynamic terahertz circular dichroism (CD) manipulation in metasurfaces. By introducing a patterned and electrically doped graphene into the metamirror consists of double layer C-shaped split ring resonators (SRRs), efficient terahertz CD modulation is observed. Since the electrical doping of graphene changes the absorption loss of the metasuface cavity, the structure shows switching between a chiral metasurface and an ordinary metal mirror, which can be seen as "on" and "off" states. The calculation results show an efficient modulation of the terahertz CD in a large dynamic range. In addition, we also use the new method to design two metasurfaces for dynamic terahertz wavefront modulation and near-field digital imaging, both of which show a high-performance electrical switching. This method provides a new way for the design of active terahertz devices based on metasurfaces, and also promotes the applications of terahertz chiral metasurfaces in high-speed wireless communication and dynamic imaging. (c) 2020 Elsevier Ltd. All rights reserved.

引用

页码：34 / 42

页数：9

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