Open AccessTunable dual plasmon-induced transparency based on a monolayer graphene metamaterial and its terahertz sensing performance
Author(s) -
Jiahao Ge,
Chenglong You,
He Feng,
Xiaoman Li,
Mei Wang,
Lifeng Dong,
Georgios Veronis,
Maojin Yun
Publication year - 2020
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.405348
Subject(s) - terahertz radiation , graphene , metamaterial , plasmon , materials science , optoelectronics , fermi energy , optics , figure of merit , refractive index , multi band device , fermi level , transformation optics , nanotechnology , physics , telecommunications , quantum mechanics , computer science , antenna (radio) , electron
In this paper, tunable dual plasmon-induced transparency (PIT) is achieved by using a monolayer graphene metamaterial in the terahertz region, which consists of two graphene strips of different sizes and a graphene ring. As the dual PIT effect is induced by the destructive interference between the two quasi-dark modes and the bright mode, we propose a four-level plasmonic system based on the linearly coupled Lorentzian oscillators to explain the mechanism behind the dual PIT. It is proved that the theoretical results agree well with the simulation results. Most importantly, the sensing properties of the designed device have been investigated in detail and we found that it can exhibit high sensitivities and figure of merit (FOM). Furthermore, the dual PIT windows can be effectively modulated by changing the Fermi energy of the graphene layer and the angle of incidence. Thus, the proposed graphene-based metamaterial can hold wide applications for switches, modulators, and multi-band refractive index sensors in the terahertz region.