Dynamically Tunable Electromagnetically Induced Transparency-Like Effect in Terahertz Metamaterial Based on Graphene Cross Structures

被引：22
作者：
Chen, Mingming [1 ,2 ]
Xiao, Zhongyin [1 ,2 ]
Lv, Fei [1 ,2 ]
Cui, Zhentao [1 ,2 ]
Xu, Qidi [1 ,2 ]
机构：
[1] Shanghai Univ, Key Lab Specialty Fiber Opt & Opt Access Networks, Sch Commun & Informat Engn, Shanghai 200444, Peoples R China
[2] Shanghai Univ, Shanghai Inst Adv Communicat & Data Sci, Sch Communicat & Informat Engn, Shanghai 200444, Peoples R China
来源：
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS | 2022年 / 28卷 / 01期
基金：
上海市自然科学基金; 中国国家自然科学基金;
关键词：
Electromagnetically induced transparency; metamaterials; graphene; slow-light; ANALOG; MANIPULATION; METASURFACES; MODULATION; RESONANCE;
D O I：
10.1109/JSTQE.2021.3091147
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
A simple and multi-layer metamaterial made of graphene to realize excellent manipulation of EIT-like effect is proposed. The unit cell consists of four layers: Substrate 1, Cross 1, Substrate 2 and Cross 2, which can obtain tunable EIT-like effect by adjusting the Fermi level of graphene. The surface current distributions of four different views clearly explain the underlying physical mechanism. A three-level.-type system is employed to describe the coupling process between Cross 1 and 2. The calculated transmission spectra based on two-particle model have great agreement with the simulated transmission spectra. In addition, the effects of geometrical parameters on EIT-like effect are discussed and wideband EIT-like effect with high transmission can be obtained by adjusting the lengths of Cross 1 and 2. Also, the polarization-insensitive character of EIT-like metamaterial is confirmed by the transmission spectra under different polarization angles. The maximum of group delay (25.48 ps) is far greater than the group delay of previously reported EIT-like metamaterials. Our study provides a novel way for the development of slow-light devices and modulators.
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页数：8
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