title: Tunable dual-band perfect absorbers based on extraordinary optical transmission and Fabry-Perot cavity resonance.
abstract: 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.
authors.affiliation: Department of Physics and Quantum Photonic Science Research Center, Hanyang University, Seoul 133-791, South Korea.
authors.forename: H Y
authors.initials: HY
authors.lastname: Zheng
authors.forename: X R
authors.initials: XR
authors.lastname: Jin
authors.forename: J W
authors.initials: JW
authors.lastname: Park
authors.forename: Y H
authors.initials: YH
authors.lastname: Lu
authors.forename: Joo Yull
authors.initials: JY
authors.lastname: Rhee
authors.forename: W H
authors.initials: WH
authors.lastname: Jang
authors.forename: H
authors.initials: H
authors.lastname: Cheong
authors.forename: Y P
authors.initials: YP
authors.lastname: Lee
mesh_terms: D000042:Absorption; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007368:Interferometry / Q000295:instrumentation*; D008027:Light; D012031:Refractometry / Q000295:instrumentation*