Dynamically tunable electromagnetically-induced-transparency–like resonances in graphene nanoring and nanodisk hybrid metamaterials

School of Physics and Electronics Science, Hunan University - Changsha 410082, China

^(a) kele1110@hnu.edu.cn

Received: 2 July 2017
Accepted: 3 October 2017

Abstract

A tunable electromagnetically-induced-transparency–like (EIT-like) device is proposed numerically and theoretically in the mid-infrared region, which is composed of periodically patterned ring and disk graphene. Distinguished from the commonly used three-level system, the hybridization of the plasmon mode is applied to describing and explaining the EIT-like phenomenon in the proposed systems. What is more, further researches have revealed that the spectral position of the transparency window can be tuned not only by geometrically changing the couple distance in graphene nanostructures, but also by dynamically altering the radius of the graphene nanodisk and the chemical potential of the graphene. At the transparency window, there exist large optical delays, which can slow down the speed of light in vacuum. This work may pave the way to the development of applications including tunable sensors, slow-light devices, and optical switches.