Open AccessTunable broad-band perfect absorber by exciting of multiple plasmon resonances at optical frequency
Author(s) -
Junqiao Wang,
Fan Chen,
Pei Ding,
JianJun He,
Yongguang Cheng,
Weiyan Hu,
GuoPing Cai,
Erjun Liang,
Qianzhong Xue
Publication year - 2012
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.20.014871
Subject(s) - plasmon , optics , materials science , surface plasmon , dielectric , dipole , resonance (particle physics) , localized surface plasmon , optoelectronics , bandwidth (computing) , surface plasmon polariton , surface plasmon resonance , physics , atomic physics , telecommunications , quantum mechanics , computer science , nanoparticle , nanotechnology
A broad-band perfect absorber composing a two-dimensional periodic metal-dielectric-metal sandwiches array on dielectric/metal substrate is designed and numerically investigated. It is shown that the nearly-perfect absorption with a bandwidth of about 50 nm in visible region can be achieved by overlapping of two plasmon resonances: one originating from the coupling of electric dipoles between adjacent unit cells and another arising from magnetic dipole plasmon resonances. A capacitor-inductor circuit description is introduced to explain the dependence of resonance frequencies and band-width on geometrical parameters.