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Dual-Band Light Absorption Enhancement in Hyperbolic Rectangular Array

1,2, 1,2,*, 1,2, 1,2, 1,2 and 1,2
1
Department of Photoelectric Information Science and Engineering, School of Science, Jiangnan University, Wuxi 214122, China
2
Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology, Jiangnan University, Wuxi 214122, China
*
Author to whom correspondence should be addressed.
Appl. Sci. 2019, 9(10), 2011; https://doi.org/10.3390/app9102011
Received: 12 April 2019 / Revised: 6 May 2019 / Accepted: 11 May 2019 / Published: 16 May 2019
(This article belongs to the Special Issue Recent Advances in Plasmonics and Nanophotonics)
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Abstract

The effect of dual-band light absorption enhancement in a hyperbolic rectangular array (HRA) is presented. The enhanced light absorption of the HRA results from the propagating surface plasmon (PSP) resonance, and a dual-band absorption with low and flat sideband level can be realized. The impedance theory is used to evaluate the absorption properties of the HRA, and shows that the input impedances of the HRA varied abruptly around the absorption bands to meet the impedance matching. The absorption spectra of the HRA can be estimated using the effective medium theory (EMT), and its accuracy can be improved as the number of film stacks is increased. The dual-band absorptions of the HRA are very robust to the variations of the width and the number of film stack. Potential application in refractive index sensing can be achieved by utilizing the two absorption bands. View Full-Text
Keywords: dual-band absorption enhancement; hyperbolic metamaterials; hyperbolic rectangular arrays; input impedances; refractive index sensing dual-band absorption enhancement; hyperbolic metamaterials; hyperbolic rectangular arrays; input impedances; refractive index sensing
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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MDPI and ACS Style

Qi, H.; Sang, T.; Wang, L.; Yin, X.; Wang, J.; Wang, Y. Dual-Band Light Absorption Enhancement in Hyperbolic Rectangular Array. Appl. Sci. 2019, 9, 2011.

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