Journal article

Wideband visible-light absorption in an ultrathin silicon nanostructure

Weiren Zhu, Fajun Xiao, Ivan D Rukhlenko, Junping Geng, Xianling Liang, Malin Premaratne, Ronghong Jin

OPTICS EXPRESS | OPTICAL SOC AMER | Published : 2017

Abstract

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 wav..

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Grants

Awarded by National Natural Science Foundation of China


Awarded by Natural Science Foundation of Shanghai


Awarded by Ministry of Education and Science of the Russian Federation


Awarded by Australian Research Council


Funding Acknowledgements

National Natural Science Foundation of China (61675170, 61571298, and 61571289), Natural Science Foundation of Shanghai (17ZR1414300), Ministry of Education and Science of the Russian Federation (14.B25.31.0002), and Australian Research Council (DP140100883).