Open AccessTunable dual-band perfect absorbers based on extraordinary optical transmission and Fabry-Perot cavity resonance
Author(s) -
Haiyu Zheng,
Xing Ri Jin,
J W Park,
YuYing Lu,
Joo Yull Rhee,
Won Ho Jang,
Hyeonsik Cheong,
Y P Lee
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.20.024002
Subject(s) - optics , fabry–pérot interferometer , materials science , multi band device , metamaterial , resonance (particle physics) , polarization (electrochemistry) , optoelectronics , metamaterial absorber , extraordinary optical transmission , tunable metamaterials , surface plasmon , physics , surface plasmon polariton , antenna (radio) , telecommunications , plasmon , wavelength , chemistry , particle physics , computer science
Magnetic resonance is considered to be a necessary condition for metamaterial perfect absorbers, and dual-band absorbers can be composed of a pair of metallic layers with anti-parallel surface currents. We designed and fabricated a tunable dual-band perfect absorber based on extraordinary-optical-transmission (EOT) effect and Fabry-Perot cavity resonance. The idea and the mechanism are completely different from the absorber based on the near-field interaction. The important advantage of our structure is that we can switch a single-band absorber to a dual-band absorber by changing the distance between two metallic layers and/or incident angle. The peak originating from the EOT effect becomes significantly narrower, resulting in an increase of the Q-factor from 16.88 to 49. The dual-band absorber can be optimized to be insensitive to the polarization of the incident electromagnetic wave by slightly modifying the absorber structure.