28 March 2017 Near-perfect absorber of infrared radiation based on Au nanorod arrays
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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    μ m , 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.
© 2017 Society of Photo-Optical Instrumentation Engineers (SPIE)
Xu Han, Xu Han, Fengyun Zhao, Fengyun Zhao, Kebo He, Kebo He, Zhubing He, Zhubing He, Zhaoyu Zhang, 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 . Submission: Received: 8 September 2016; Accepted: 14 March 2017
Received: 8 September 2016; Accepted: 14 March 2017; Published: 28 March 2017
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