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Large-area mid-infrared absorbers based on inverse opals (Conference Presentation)
Author(s): Alireza Shahsafi; Graham Joe; Sören Brandt; Anna V. Shneidman; Nicholas Stanisic; Yuzhe Xiao; Zhaoning Yu; Jad Salman; Joanna Aizenberg; Mikhail A. Kats

Paper Abstract

Engineered mid-infrared absorbers and thermal emitters have recently enabled a variety of applications including passive cooling and acceleration of water condensation. We demonstrate a large-area absorber in the 8-10 μm range based on a lossy medium with an ultra-low refractive index. Our low-index material is a large-area inverse opal film (air holes, silica matrix), which is crack-free on the centimeter scale. Due to the large fraction of air in these structures (more than 70%), their effective refractive index is close to that of air, facilitating an impedance match for a broad range of incidence angles, and requiring no top-down patterning.

Paper Details

Date Published: 8 March 2019
Proc. SPIE 10927, Photonic and Phononic Properties of Engineered Nanostructures IX, 109270M (8 March 2019); doi: 10.1117/12.2510809
Show Author Affiliations
Alireza Shahsafi, Univ. of Wisconsin-Madison (United States)
Graham Joe, Univ. of Wisconsin-Madison (United States)
Sören Brandt, Harvard Univ. (United States)
Anna V. Shneidman, Harvard Univ. (United States)
Nicholas Stanisic, Univ. of Wisconsin-Madison (United States)
Yuzhe Xiao, Univ. of Wisconsin-Madison (United States)
Zhaoning Yu, Univ. of Wisconsin-Madison (United States)
Jad Salman, Univ. of Wisconsin-Madison (United States)
Joanna Aizenberg, Harvard Univ. (United States)
Mikhail A. Kats, Univ. of Wisconsin-Madison (United States)

Published in SPIE Proceedings Vol. 10927:
Photonic and Phononic Properties of Engineered Nanostructures IX
Ali Adibi; Shawn-Yu Lin; Axel Scherer, Editor(s)

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