Thin-film, wide-angle, design-tunable, selective absorber from near UV to far infrared

Janardan Nath; Douglas Maukonen; Evan Smith; Pedro Figueiredo; Guy Zummo; Deep Panjwani; Robert E. Peale; Glenn Boreman; Justin W. Cleary; Kurt Eyink

doi:10.1117/12.2017958

11 June 2013 Thin-film, wide-angle, design-tunable, selective absorber from near UV to far infrared

Janardan Nath, Douglas Maukonen, Evan Smith, Pedro Figueiredo, Guy Zummo, Deep Panjwani, Robert E. Peale, Glenn Boreman, Justin W. Cleary, Kurt Eyink

Author Affiliations +

Proceedings Volume 8704, Infrared Technology and Applications XXXIX; 87041D (2013) https://doi.org/10.1117/12.2017958
Event: SPIE Defense, Security, and Sensing, 2013, Baltimore, Maryland, United States

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.

Citation Download Citation

Janardan Nath, Douglas Maukonen, Evan Smith, Pedro Figueiredo, Guy Zummo, Deep Panjwani, Robert E. Peale, Glenn Boreman, Justin W. Cleary, and Kurt Eyink "Thin-film, wide-angle, design-tunable, selective absorber from near UV to far infrared", Proc. SPIE 8704, Infrared Technology and Applications XXXIX, 87041D (11 June 2013); https://doi.org/10.1117/12.2017958

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