Abstract
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.
Funder
Japan Society for the Promotion of Science
Japan Science and Technology Agency
Subject
General Physics and Astronomy,General Engineering
Cited by
3 articles.
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