Open AccessHighly improved, non-localized field enhancement enabled by hybrid plasmon of crescent resonator/graphene in infrared wavelength
Author(s) -
Chen Chen,
Guan Wang,
Lilan Peng,
Kai Zhang
Publication year - 2017
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.25.023302
Subject(s) - graphene , plasmon , materials science , resonator , surface plasmon , optoelectronics , optics , terahertz radiation , surface plasmon resonance , localized surface plasmon , surface plasmon polariton , wavelength , split ring resonator , infrared , nanotechnology , physics , nanoparticle
The development of surface enhanced infrared absorption has been constrained by the limited field enhancement and narrow-band resonance of commonly used metal resonators. In this theoretical work, the design of a crescent resonator (CR) combined with graphene-enabled plasmon tuning is proposed to settle the drawbacks. The CR is similar to a split ring resonator (SRR), but exhibits a much improved field enhancement. The influence of graphene on the field enhancement of the CR has been systematically investigated. Coupling from localized plasmon of CR to propagating plasmon of graphene has been observed, and the constructive interference of the plasmon wave has led to not only better enhancement inside the gap but also usable enhancements all over the graphene film, which go beyond the localized nature of metal plasmons.