Ultra-broadband nanowire metamaterial absorber

Broadband absorbers generally consist of plasmonic cavities coupled to metallic resonators separated by a dielectric film, and they are vertically stacking configurations. In this work, we propose an ultra-broadband nanowire metamaterial absorber composed of an array of vertically aligned dielectric...

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Bibliographic Details
Published in:Photonics research (Washington, DC) DC), 2022-12, Vol.10 (12), p.2718
Main Authors: Wang, Baoqing, Ma, Cuiping, Yu, Peng, Govorov, Alexander O., Xu, Hongxing, Wang, Wenhao, Besteiro, Lucas V., Jing, Zhimin, Li, Peihang, Wang, Zhiming
Format: Article
Language:English
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Summary:Broadband absorbers generally consist of plasmonic cavities coupled to metallic resonators separated by a dielectric film, and they are vertically stacking configurations. In this work, we propose an ultra-broadband nanowire metamaterial absorber composed of an array of vertically aligned dielectric nanowires with coaxial metallic rings. The absorber shows strong absorption from 0.2 to 7 μm with an average absorption larger than 91% due to the excitation of gap surface plasmon polariton modes in Fabry–Perot-like resonators. Moreover, a refractory dielectric cladding can be added to improve the thermal stability of the absorber, showing a negligible impact on its absorption performance. The proposed absorber may find potential applications in solar energy harvesting, infrared imaging and spectroscopy, and optoelectronic devices.
ISSN:2327-9125
2327-9125
DOI:10.1364/PRJ.473332