Large-area mid-infrared absorbers based on inverse opals (Conference Presentation)

Alireza Shahsafi; Graham Joe; Sören Brandt; Anna V. Shneidman; Nicholas Stanisic; Yuzhe Xiao; Zhaoning Yu; Jad Salman; Joanna Aizenberg; Mikhail A. Kats

doi:10.1117/12.2510809

8 March 2019 Large-area mid-infrared absorbers based on inverse opals (Conference Presentation)

Alireza Shahsafi, Graham Joe, Sören Brandt, Anna V. Shneidman, Nicholas Stanisic, Yuzhe Xiao, Zhaoning Yu, Jad Salman, Joanna Aizenberg, Mikhail A. Kats

Author Affiliations +

Proceedings Volume 10927, Photonic and Phononic Properties of Engineered Nanostructures IX; 109270M (2019) https://doi.org/10.1117/12.2510809
Event: SPIE OPTO, 2019, San Francisco, California, United States

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.

Conference Presentation

Citation Download Citation

Alireza Shahsafi, Graham Joe, Sören Brandt, Anna V. Shneidman, Nicholas Stanisic, Yuzhe Xiao, Zhaoning Yu, Jad Salman, Joanna Aizenberg, and Mikhail A. Kats "Large-area mid-infrared absorbers based on inverse opals (Conference Presentation)", Proc. SPIE 10927, Photonic and Phononic Properties of Engineered Nanostructures IX, 109270M (8 March 2019); https://doi.org/10.1117/12.2510809

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