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Tunable broad-band perfect absorber by exciting of multiple plasmon resonances at optical frequency
Author(s) -
Junqiao Wang,
Chunzhen Fan,
Pei Ding,
Jinna He,
Y.D Cheng,
Weiqin Hu,
Genwang 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 , dielectric , dipole , surface plasmon , resonance (particle physics) , optoelectronics , localized surface plasmon , magnetic dipole , surface plasmon resonance , bandwidth (computing) , physics , atomic physics , telecommunications , quantum mechanics , nanoparticle , computer science , 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.

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