Near-perfect absorber of infrared radiation based on Au nanorod arrays

Xu Han; Fengyun Zhao; Kebo He; Zhubing He; Zhaoyu Zhang

doi:10.1117/1.JNP.11.016018

28 March 2017 Near-perfect absorber of infrared radiation based on Au nanorod arrays

Xu Han, Fengyun Zhao, Kebo He, Zhubing He, Zhaoyu Zhang

Author Affiliations +

Journal of Nanophotonics, Vol. 11, Issue 1, 016018 (March 2017). https://doi.org/10.1117/1.JNP.11.016018

Abstract

A polarization-independent metamaterial near-perfect absorber is numerically studied in the infrared range in a two-perpendicular-nanorod design. It is shown that the absorptance and the peak wavelength associated with magnetic resonance are sensitive to the nanorod length, the thickness, and the refractive index of the spacer, while only being slightly affected by the period and the distance between neighboring nanorods. This design shows two absorption peaks with absorptance values of 89% and 83% at the wavelengths of 1.24 and 1.46 μm, respectively. Furthermore, the absorptance and the peak wavelength associated with magnetic resonance show negligible dependence on the polarization angle. These properties are advantageous for applications, including thermal sensing and selective emitters in thermophotovoltaics.

Citation Download Citation

Xu Han, Fengyun Zhao, Kebo He, Zhubing He, and Zhaoyu Zhang "Near-perfect absorber of infrared radiation based on Au nanorod arrays," Journal of Nanophotonics 11(1), 016018 (28 March 2017). https://doi.org/10.1117/1.JNP.11.016018

Received: 8 September 2016; Accepted: 14 March 2017; Published: 28 March 2017

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