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Issue 40, 2018
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Structurally tunable plasmonic absorption bands in a self-assembled nano-hole array

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Abstract

In this paper, we demonstrate a theoretical and experimental study on a nano-hole array that can realize perfect absorption in the visible and near-infrared regions. The absorption spectrum can be easily controlled by adjusting the structural parameters including the radius and period of the nano-hole, and the maximal absorption can reach 99.0% in theory. In order to clarify the physical mechanism of the absorber, we start from the extraordinary optical transmission supported by the nano-hole array in a thin metallic film coated on a glass substrate, and then analyse the perfect absorption in the metal–insulator–metal structure. The surface plasmon modes supported by the nano-hole array are completely clarified and both the FDTD simulation and waveguide theory are used to help us understand the physical mechanism, which can provide a new perspective in designing this kind of perfect absorber. In addition, the nano-hole array can be fabricated by simple and low-cost nanosphere lithography, which makes it a more appropriate candidate for spectroscopy, photovoltaics, photodetectors, sensing, and surface enhanced Raman scattering.

Graphical abstract: Structurally tunable plasmonic absorption bands in a self-assembled nano-hole array

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Article information


Submitted
15 Aug 2018
Accepted
25 Sep 2018
First published
28 Sep 2018

Nanoscale, 2018,10, 19117-19124
Article type
Paper

Structurally tunable plasmonic absorption bands in a self-assembled nano-hole array

Q. Li, Z. Li, X. Wang, T. Wang, H. Liu, H. Yang, Y. Gong and J. Gao, Nanoscale, 2018, 10, 19117
DOI: 10.1039/C8NR06588H

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