Open AccessTunable Fano resonances of a graphene/waveguide hybrid structure at mid-infrared wavelength
Author(s) -
Jun Guo,
Leyong Jiang,
Xiaoyu Dai,
Yuanjiang Xiang
Publication year - 2016
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.24.004740
Subject(s) - fano resonance , graphene , surface plasmon polariton , plasmon , materials science , optics , surface plasmon , planar , wavelength , waveguide , transfer matrix method (optics) , polariton , fano plane , electric field , infrared , optoelectronics , doping , physics , nanotechnology , computer graphics (images) , mathematics , quantum mechanics , computer science , pure mathematics
A planar graphene/dielectric multilayer structure is investigated, where the graphene surface plasmon polariton and the planar waveguide mode are coupled to realize Fano resonances. Few-layer graphene with high doping levels is used to excite surface plasmons at mid-infrared wavelength. Reflectance of the structure is calculated numerically by transfer-matrix method, and tunable Fano resonances with different line shapes are demonstrated by varying doping levels of graphene. Properties of the Fano resonances are discussed qualitatively by calculating electric field distribution in the structure and quantitatively by utilizing an analytical fitting equation. We also calculate Goos-Hänchen shift of the Fano resonances as an example for potential applications, and find that large Goos-Hänchen shift appears for optimized doping levels of graphene.