Dynamically Tunable Resonant Strength in Electromagnetically Induced Transparency (EIT) Analogue by Hybrid Metal-Graphene Metamaterials

Chaode Lao; Yaoyao Liang; Xianjun Wang; Haihua Fan; Faqiang Wang; Hongyun Meng; Jianping Guo; Hongzhan Liu; Zhongchao Wei

doi:10.3390/nano9020171

Dynamically Tunable Resonant Strength in Electromagnetically Induced Transparency (EIT) Analogue by Hybrid Metal-Graphene Metamaterials

Nanomaterials (Basel). 2019 Jan 30;9(2):171. doi: 10.3390/nano9020171.

Authors

Chaode Lao¹, Yaoyao Liang², Xianjun Wang³, Haihua Fan⁴, Faqiang Wang⁵, Hongyun Meng⁶, Jianping Guo⁷, Hongzhan Liu⁸, Zhongchao Wei⁹

Affiliations

¹ Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices, School of Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou 510006, China. laochaode@m.scnu.edu.cn.
² Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices, School of Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou 510006, China. lyy777@m.scnu.edu.cn.
³ Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices, School of Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou 510006, China. 2016021810@m.scnu.edu.cn.
⁴ Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices, School of Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou 510006, China. 20111249@m.scnu.edu.cn.
⁵ Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices, School of Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou 510006, China. fqwang@scnu.edu.cn.
⁶ Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices, School of Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou 510006, China. hymeng@scnu.edu.cn.
⁷ Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices, School of Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou 510006, China. guojp@scnu.edu.cn.
⁸ Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices, School of Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou 510006, China. lhzscnu@163.com.
⁹ Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices, School of Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou 510006, China. wzc@scnu.edu.cn.

Abstract

In this paper, a novel method to realize a dynamically tunable analogue of EIT for the resonance strength rather than the resonance frequency is proposed in the terahertz spectrum. The introduced method is composed of a metal EIT-like structure, in which a distinct EIT phenomenon resulting from the near field coupling between bright and dark mode resonators can be obtained, as well as an integrated monolayer graphene ribbon under the dark mode resonator that can continuously adjust the resonance strength of transparency peak by changing the Fermi level of the graphene. Comparing structures that need to be modulated individually for each unit cell of the metamaterials, the proposed modulation mechanism was convenient for achieving synchronous operations for all unit cells. This work demonstrates a new platform of modulating the EIT analogue and paves the way to design terahertz functional devices which meet the needs of optical networks and terahertz communications.

Keywords: EIT analogue; graphene ribbon; resonance intensity; tunable EIT.

Grants and funding

61774062, 11674107, 61475049, 11674109/National Natural Science Foundation of China