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Title: Tungsten based anisotropic metamaterial as an ultra-broadband absorber
Authors: Lin, Y
Cui, Y
Ding, F
Fung, KH 
Ji, T
Li, D
Hao, Y
Issue Date: 2017
Publisher: Optical Society of America
Source: Optical materials express, 2017, v. 7, no. 2, p. 606-617 How to cite?
Journal: Optical materials express 
Abstract: We show theoretically that an array of tungsten/germanium anisotropic nano-cones placed on top of a reflective substrate can absorb light at the wavelength range from 0.3 μm to 9 μm with an average absorption efficiency approaching 98%. It is found that the excitation of multiple orders of slow-light resonant modes is responsible for the efficient absorption at wavelengths longer than 2 μm, and the anti-reflection effect of tapered lossy material gives rise to the near perfect absorption at shorter wavelengths. The absorption spectrum suffers a small dip at around 4.2 μm where the first order and second order slow-light modes get overlapped, but we can get rid of this dip if the absorption band edge at a long wavelength range is reduced down to 5 μm. The parametrical study reflects that the absorption bandwidth is mainly determined by the filling ratio of tungsten as well as the bottom diameter of the nano-cones and the interaction between neighboring nano-cones is quite weak. Our proposal has some potential applications in the areas of solar energy harvesting and thermal emitters.
EISSN: 2159-3930
DOI: 10.1364/OME.7.000606
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