Plasmonic Refractive Index Sensors Based on One- and Two-Dimensional Gold Grating on a Gold Film
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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, and Xiaolei WEN3 1
School of Science, Lanzhou University of Technology, Lanzhou 730050, China
2
College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, China
3
Center for Micro- and Nanoscale Research and Fabrication, University of Science and Technology of China, Hefei
230026, China *
Corresponding author: Xiangxian WANG
E-mail: [email protected]
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 660 RIU/nm and 169 RIU–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 plasmon; refractive index; sensor; grating Citation: Jiankai ZHU, Xiangxian WANG, Yuan WU, Yingwen SU, Tianxu JIA, Hua YANG, et al.,“Plasmonic Refractive Index Sensors Based on One- and Two-Dimensional Gold Grating on a Gold Film,” Photonic Sensors, DOI: 10.1007/s13320-020-0598-x.
1. Introduction Due to the continuous development of the fabrication technology in the sub-wavelength scale, various nano-devices based on surface plasmons have been developed rapidly [1–3], which have achieved many breakthroughs from theory to reality. For example, based on the fact that the propagating surface plasmons can break through the diffraction limit, a more miniaturized and integrated waveguide device can be made [4, 5]. The electric field
enhancement [6–8] and strong absorption [9, 10] caused by the local surface plasmons are widely used in surface-enhanced Raman scattering [11–13] and enhanced absorption [14, 15]. In addition, the unique optical properties of surface plasmons have a wide range of applications in photocatalysis [16–20], absorber [21–24], photolithography [25–28], filter [29, 30], optical data storage [31, 32], and other fields [33–36]. At present, one of the most important researches focusing on surface plasmons is
Received: 12 February 2020 / Revised: 28 June 2020 © The Author(s) 2020. This article is published with open access at Springerlink.com
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