Optically thin composite resonant absorber at the near-infrared band: A polarization independent and spectrally broadband configuration

Date
2011
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Source Title
Optics Express
Print ISSN
10944087
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Publisher
Optical Society of American (OSA)
Volume
19
Issue
15
Pages
14260 - 14267
Language
English
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Abstract

We designed, fabricated, and experimentally characterized thin absorbers utilizing both electrical and magnetic impedance matching at the near-infrared regime. The absorbers consist of four main layers: a metal back plate, dielectric spacer, and two artificial layers. One of the artificial layers provides electrical resonance and the other one provides magnetic resonance yielding a polarization independent broadband perfect absorption. The structure response remains similar for the wide angle of incidence due to the sub-wavelength unit cell size of the constituting artificial layers. The design is useful for applications such as thermal photovoltaics, sensors, and camouflage. ©2011 Optical Society of America.

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