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Electrically tunable slow light using graphene metamaterials

Kim, Teun-Teun, Kim, Hyeon-Don, Zhao, Rongkuo, Oh, Sang Soon, Ha, Taewoo, Chung, Dong Seob, Lee, Young Hee, Min, Bumki and Zhang, Shuang 2018. Electrically tunable slow light using graphene metamaterials. ACS Photonics 5 (5) , pp. 1800-1807. 10.1021/acsphotonics.7b01551

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Abstract

Metamaterials with classical analogues of electromagnetically induced transparency open new avenues in photonics for realizing smaller, more efficient slow light devices without quantum approaches. However, most of the metamaterial-based slow light devices are passive, which limits their practical applications. Here, by combining diatomic metamaterials with a gated single-layer graphene, we demonstrate that the group delay of terahertz light can be dynamically controlled under a small gate voltage. Using a two coupled harmonic oscillators model, we show that this active control of group delay is made possible by an effective control of the dissipative loss of the radiative dark resonator by varying the graphene’s optical conductivity. Our work may provide opportunities in the design of various applications such as compact slow light devices and ultrasensitive sensors and switches.

Item Type: Article
Date Type: Published Online
Status: Published
Schools: Physics and Astronomy
Publisher: ACS Publications
ISSN: 2330-4022
Funders: European Regional Development Fund
Date of First Compliant Deposit: 7 June 2018
Date of Acceptance: 1 March 2018
Last Modified: 18 Oct 2019 15:37
URI: http://orca.cf.ac.uk/id/eprint/109730

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