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Ultrabroadband Light Absorption by a Sawtooth Anisotropic Metamaterial Slab
Yanxia Cui
1
,
2
,
3 ,
Kin Hung Fung
2
,
4 ,
Jun Xu
2
,
4 ,
Hyungjin Ma
2 ,
Yi Jin
1 ,
Sailing He
1 ,
Nicholas X. Fang
2
,
4
February 07 2012
February 08 2012
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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.