Journal
OPTICS EXPRESS
Volume 25, Issue 5, Pages 5781-5786Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.25.005781
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Funding
- National Natural Science Foundation of China [61675170, 61571298, 61571289]
- Natural Science Foundation of Shanghai [17ZR1414300]
- Ministry of Education and Science of the Russian Federation [14.B25.31.0002]
- Australian Research Council [DP140100883]
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We design a new kind of metamaterial absorber in the form of an ultrathin silicon nanostructure capable of having wideband absorption of visible light. We show that our metamaterial can exhibit almost perfect absorption of incident light even though its thickness is several tens of times smaller than the optical wavelength. The combination of two resonant modes in a single nanostructure allows us to achieve absorptivities exceeding 80% in a wide band spanning from 437.9 to 578.3 nm. The physical origins of the two modes, elucidated via the analysis of current distribution inside the nanostructure, explain different metamaterial absorptivities for oblique incidence of TE- and TM-polarized waves. Our study opens a new prospect in designing ultrathin, yet wideband visible-light absorbers based on silicon. (C) 2017 Optical Society of America
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