Open AccessTunable multispectral plasmon induced transparency based on graphene metamaterials
Author(s) -
Chen Sun,
Jiangnan Si,
Zhewei Dong,
Xiaoxu Deng
Publication year - 2016
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.24.011466
Subject(s) - graphene , terahertz radiation , metamaterial , plasmon , finite difference time domain method , optics , multispectral image , materials science , electromagnetically induced transparency , optoelectronics , coupled mode theory , fermi energy , slow light , physics , refractive index , photonic crystal , nanotechnology , quantum mechanics , computer science , computer vision , electron
A dynamically wavelength tunable multispectral plasmon induced transparency (PIT) device based on graphene metamaterials, which is composed of periodically patterned graphene double layers separated by a dielectric layer, is proposed theoretically and numerically in the terahertz frequency range. Considering the near-field coupling of different graphene layers and the bright-dark mode coupling in the same graphene layer, the coupled Lorentz oscillator model is adapted to explain the physical mechanism of multispectral EIT-like responses. The simulated transmission based on the finite-difference time-domain (FDTD) solutions indicates that the shifting and depth of the EIT resonances in multiple PIT windows are controlled by different geometrical parameters and Fermi energies distributions. A design scheme with graphene integration is employed, which allows independent tuning of resonance frequencies by electrostatically changing the Fermi energies of graphene double layer. Active control of the multispectral EIT-like responses enables the proposed device to be widely applied in optical information processing as tunable sensors, switches, and filters.