Stacked all-dielectric absorber based on degenerate critical coupling for visible to near-infrared light

We design a wideband all-dielectric perfect absorber of nanopillar Mie resonators based on degenerate critical coupling. In addition, the nanopillar perfect absorber is found to have a characteristic “degenerate critical length” beyond which the absorption peak is almost unaffected by increasing len...

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Veröffentlicht in:Applied physics express 2022-12, Vol.15 (12), p.122006
Hauptverfasser: Xu, Rongyang, Takahara, Junichi
Format: Artikel
Sprache:eng
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Zusammenfassung:We design a wideband all-dielectric perfect absorber of nanopillar Mie resonators based on degenerate critical coupling. In addition, the nanopillar perfect absorber is found to have a characteristic “degenerate critical length” beyond which the absorption peak is almost unaffected by increasing length. Based on the existence of the degenerate critical length, we develop a broadband dielectric quasi-perfect absorber by stacking nanopillar Mie resonators of different materials that selectively absorb incident light like photon sorters. The 1300 nm-thick absorber achieves an average absorptivity of above 94% from 300 to 1000 nm and has great potential for photodetection and photovoltaic applications.
ISSN:1882-0778
1882-0786
DOI:10.35848/1882-0786/aca195