Ultrabroadband light absorption by a sawtooth anisotropic metamaterial slab
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Fang_Ultrabroadband light.pdf
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Author(s)
Cui, Yanxia
Fung, Kin Hung
Xu, Jun
Ma, Hyungjin
Jin, Yi
He, Sailing
Fang, Nicholas Xuanlai
Date Issued
February 2012
Journal
Nano Letters
Publisher
American Chemical Society (ACS)
Citation
Cui, Yanxia et al. “Ultrabroadband Light Absorption by a Sawtooth Anisotropic Metamaterial Slab.” Nano Letters 12.3 (2012): 1443–1447.
Version
Author's final manuscript
Abstract
We present an ultrabroadband thin-film infrared absorber made of sawtoothed anisotropic metamaterial. Absorptivity of higher than 95% at normal incidence is supported in a wide range of frequencies, where the full absorption width at half-maximum is about 86%. Such property is retained well at a very wide range of incident angles too. Light of shorter wavelengths are harvested at upper parts of the sawteeth of smaller widths, while light of longer wavelengths are trapped at lower parts of larger tooth widths. This phenomenon is explained by the slowlight modes in anisotropic metamaterial waveguide. Our study can be applied in the field of designing photovoltaic devices and thermal emitters.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
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Creative Commons Attribution-Noncommercial-Share Alike 3.0
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DOI of Published Version
https://doi.org/10.1021/nl204118h
