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Regular | Open Access

Plasmonic Refractive Index Sensors Based on One- and Two-Dimensional Gold Grating on a Gold Film

Jiankai ZHU1, Xiangxian WANG1( ), Yuan WU1, Yingwen SU1, Tianxu JIA1, Hua YANG1, Liping ZHANG1, Yunping QI2, Xiaolei WEN3
School of Science, Lanzhou University of Technology, Lanzhou 730050, China
College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, China
Center for Micro- and Nanoscale Research and Fabrication, University of Science and Technology of China, Hefei 230026, China
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Abstract

In this paper, we propose two kinds of composite structures based on the one- and two-dimensional (1D&2D) gold grating on a gold film for plasmonic refractive index sensing. The resonance modes and sensing characteristics of the composite structures are numerically simulated by the finite-difference time-domain method. The composite structure of the 1D gold semi-cylinder grating and gold film is analyzed first, and the optimized parameters of the grating period are obtained. The sensitivity and figure of merit (FOM) can reach 660RIU/nm and 169RIU−1, respectively. Then, we replace the 1D grating with the 2D gold semi-sphere particles array and find that the 2D grating composite structure can excite strong surface plasmon resonance intensity in a wider period range. The sensitivity and FOM of the improved composite structure can reach 985 RIU/nm and 298 RIU−1, respectively. At last, the comparison results of the sensing performance of the two structures are discussed. The proposed structures can be used for bio-chemical refractive index sensing.

Keywords

Surface plasmonrefractive indexsensorgrating

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Photonic Sensors
Volume 10 Issue 4,
December 2020
Pages 375-386
DOI: 10.1007/s13320-020-0598-x

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Cite this article:
ZHU J, WANG X, WU Y, et al. Plasmonic Refractive Index Sensors Based on One- and Two-Dimensional Gold Grating on a Gold Film. Photonic Sensors, 2020, 10(4): 375-386. https://doi.org/10.1007/s13320-020-0598-x

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Received: 12 February 2020
Revised: 28 June 2020
Published: 11 August 2020
© The Author(s) 2020.

This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.