Electrically Tunable Perfect Terahertz Absorber Based on a Graphene Salisbury Screen Hybrid Metasurface

被引:93
|
作者
Chen, Xieyu [1 ,2 ]
Tian, Zhen [1 ,2 ]
Lu, Yongchang [1 ,2 ]
Xu, Yuehong [1 ,2 ]
Zhang, Xueqian [1 ,2 ]
Ouyang, Chunmei [1 ,2 ]
Gu, Jianqiang [1 ,2 ]
Han, Jiaguang [1 ,2 ]
Zhang, Weili [1 ,2 ,3 ]
机构
[1] Tianjin Univ, Coll Precis Instrument & Optoelect Engn, Ctr Terahertz Waves, Tianjin 300072, Peoples R China
[2] Tianjin Univ, Key Lab Optoelect Informat & Technol, Tianjin 300072, Peoples R China
[3] Oklahoma State Univ, Sch Elect & Comp Engn, Stillwater, OK 74078 USA
来源
ADVANCED OPTICAL MATERIALS | 2020年 / 8卷 / 03期
基金
美国国家科学基金会;
关键词
electrical tunability; graphene; perfect absorber; terahertz; METAMATERIAL ABSORBER; ABSORPTION; MODULATION; DESIGN;
D O I
10.1002/adom.201900660
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Graphene, as a popular 2D semiconductor, with a carrier concentration that can be extensively tailored by external stimulants, such as electric bias and photoexcitation, is a promising candidate for active optoelectronics. An electrically tunable perfect terahertz absorber is presented by integrating a metallic grating into classical graphene Salisbury screen. The measurement shows that perfect absorption can be achieved for even lightly-doped graphene and a modulation depth up to 25% is realized. Numerical simulation and analytical model based on the transmission line theory are developed to validate the design, showing a good agreement with the measured results. In addition, dependence of the terahertz response on physical dimensions and polarization of the incident terahertz field is also experimentally explored. It indicates that the hybrid terahertz device is able to function as tunable perfect absorber or tunable polarizer with an extinction ratio up to 23 dB. These results demonstrate the feasibility of using low carrier mobility chemical vapor deposition (CVD) grown graphene for tunable perfect terahertz absorption, which is suitable for potential applications, such as terahertz switching, and time domain and spatial domain modulation.
引用
收藏
页数:9
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