Title

Thin-Film, Wide-Angle, Design-Tunable, Selective Absorber From Near Uv To Far Infrared

Keywords

far-IR; Long wave infra-red (LWIR); metamaterial absorber; near-IR; plasmonics; Selective absorbers

Abstract

We experimentally demonstrate a structured thin film that selectively absorbs incident electromagnetic waves in discrete bands, which by design occur in any chosen range from near UV to far infrared. The structure consists of conducting islands separated from a conducting plane by a dielectric layer. By changing dimensions and materials, we have achieved broad absorption resonances centered at 0.36, 1.1, 14, and 53 microns wavelength. Angle-dependent specular reflectivity spectra are measured using UV-visible or Fourier spectrometers. The peak absorption ranges from 85 to 98%. The absorption resonances are explained using the model of an LCR resonant circuit created by coupling between dipolar plasma resonance in the surface structures and their image dipoles in the ground plane. The resonance wavelength is proportional to the dielectric permittivity and to the linear dimension of the surface structures. These absorbers have application to thermal detectors of electromagnetic radiation. © 2013 SPIE.

Publication Date

9-17-2013

Publication Title

Proceedings of SPIE - The International Society for Optical Engineering

Volume

8704

Number of Pages

-

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.1117/12.2017958

Socpus ID

84883750950 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84883750950

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