Open AccessStrong longitudinal coupling of Tamm plasmon polaritons in graphene/DBR/Ag hybrid structure
Author(s) -
Jigang Hu,
Enxu Yao,
Xie Wang,
Wei Liu,
Dongmei Li,
Yonghua Lu,
Qiwen Zhan
Publication year - 2019
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.27.018642
Subject(s) - graphene , plasmon , materials science , coupled mode theory , polariton , coupling (piping) , fermi energy , optoelectronics , surface plasmon , surface plasmon polariton , fermi level , optics , absorption (acoustics) , condensed matter physics , physics , nanotechnology , refractive index , quantum mechanics , metallurgy , electron
In this paper, strong longitudinal coupling of the Tamm plasmon polaritons (TPPs) is investigated in a graphene/DBR/Ag slab hybrid system. It is found that TPPs can be excited at both the top graphene and the bottom silver slab interface, which can strongly interact with each other in this coupled structure. Numerical simulation results demonstrate that the vertical Tamm plasmon coupling can be either tuned by adjusting the geometric parameters or actively controlled by the Fermi energy in graphene sheet as well as the incident angle of light, allowing for strong light-matter interaction with a tunable dual-band perfect absorption. Moreover, the coupling strength of the hybrid modes exhibits a large tuning range, from a large Rabi splitting to an extremely narrow induced transparency in this coupled regime. Coupled mode theory has been employed to explain the strong coupling phenomenon. The controllable TPP coupling with an ultrahigh dual-band absorption capability offered by this simple layered structure opens new avenues for developing a broad range of graphene-based active optoelectronic and polaritonic devices.