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Proceedings Paper

Infra-red spectral microscopy of standing-wave resonances in single metal-dielectric-metal thin-film cavity
Author(s): Janardan Nath; Deep Panjwani; Farnood Khalilzadeh-Rezaie; Mehmet Yesiltas; Evan M. Smith; James C. Ginn; David J. Shelton; Carol Hirschmugl; Justin W. Cleary; Robert E. Peale
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Paper Abstract

Resonantly absorbing thin films comprising periodically sub-wavelength structured metal surface, dielectric spacer, and metal ground plane are a topic of current interest with important applications. These structures are frequently described as “metamaterials”, where effective permittivity and permeability with dispersion near electric and magnetic resonances allow impedance matching to free space for maximum absorption. In this paper, we compare synchrotron-based infrared spectral microscopy of a single isolated unit cell and a periodic array, and we show that the resonances have little to do with periodicity. Instead, the observed absorption spectra of usual periodically structured thin films are best described as due to standing-wave resonances within each independent unit cell, rather than as due to effective optical constants of a metamaterial. The effect of having arrays of unit cells is mainly to strengthen the absorption by increasing the fill factor, and such arrays need not be periodic. Initial work toward applying the subject absorbers to room-temperature bolometer arrays is presented.

Paper Details

Date Published: 1 September 2015
PDF: 7 pages
Proc. SPIE 9544, Metamaterials, Metadevices, and Metasystems 2015, 95442M (1 September 2015); doi: 10.1117/12.2188198
Show Author Affiliations
Janardan Nath, Univ. of Central Florida (United States)
Deep Panjwani, Univ. of Central Florida (United States)
Farnood Khalilzadeh-Rezaie, Univ. of Central Florida (United States)
Mehmet Yesiltas, Univ. of Central Florida (United States)
Evan M. Smith, Univ. of Central Florida (United States)
Plasmonics, Inc. (United States)
James C. Ginn, Plasmonics, Inc. (United States)
David J. Shelton, Plasmonics, Inc. (United States)
Carol Hirschmugl, Univ. of Wisconsin-Milwaukee (United States)
Justin W. Cleary, Air Force Research Lab. (United States)
Robert E. Peale, Univ. of Central Florida (United States)

Published in SPIE Proceedings Vol. 9544:
Metamaterials, Metadevices, and Metasystems 2015
Nader Engheta; Mikhail A. Noginov; Nikolay I. Zheludev, Editor(s)

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