Issue 65, 2018
From the journal:

RSC Advances

Tunable bandwidth of double electromagnetic induced transparency windows in terahertz graphene metamaterial

Yue Wang,a   Mengning Tao,a   Zhen Pei,a   Xuzheng Yu,a   Benhua Wang,a   Jiuxing Jianga  and  Xunjun He ORCID logo *a  

* Corresponding authors

a School of Science, Harbin University of Science and Technology, No. 52 Xuefu Road, Nangang District, Harbin, Heilongjiang, P. R. China
E-mail: hexunjun@hrbust.edu.cn

Abstract

By patterning graphene on a SiO2/Si substrate, in this paper, we design and numerically investigate double electromagnetic induced transparency (EIT) windows in a terahertz metamaterial based on a π-like graphene structure. The surface current distributions reveal that the double EIT windows arise from the destructive interferences caused by different asymmetric coupling modes. Moreover, the bandwidth of two transparency windows can be actively controlled by changing the asymmetric coupling strength. By shifting the Fermi energy of graphene, more interestingly, the bandwidth and frequency modulation depths of the two transparency windows is 38.4% and 36% respectively, and the associated group delay and delay bandwidth product (DBP) can also be actively tuned. Therefore, such EIT-like graphene metamaterials are promising candidates for designing slow-light devices and wide-band filters.

Graphical abstract: Tunable bandwidth of double electromagnetic induced transparency windows in terahertz graphene metamaterial

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Article information

DOI
https://doi.org/10.1039/C8RA06008H
Article type
Paper
Submitted
14 Jul 2018
Accepted
14 Oct 2018
First published
05 Nov 2018
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2018,8, 37057-37063

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Tunable bandwidth of double electromagnetic induced transparency windows in terahertz graphene metamaterial

Y. Wang, M. Tao, Z. Pei, X. Yu, B. Wang, J. Jiang and X. He, RSC Adv., 2018, 8, 37057 DOI: 10.1039/C8RA06008H

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