| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Plasmonic sensor with self-reference capability based on functional layer film composed of Au/Si gratings |
| Jiankai Zhu(朱剑凯)1, Xiangxian Wang(王向贤)1,†, Yunping Qi(祁云平)2, and Jianli Yu(余建立)3 |
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 School of Electronic Engineering, Chaohu University, Chaohu 238000, China |
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Abstract We propose a simple one-dimensional grating coupling system that can excite multiple surface plasmon resonances for refractive index (RI) sensing with self-reference characteristics in the near-infrared band. Using theoretical analysis and the finite-difference time-domain method, the plasmonic mechanism of the structure is discussed in detail. The results show that the excited resonances are independent of each other and have different fields of action. The mode involving extensive interaction with the analyte environment achieves a high sensitivity of 1236 nm/RIU, and the figure of merit (FOM) can reach 145 RIU-1. Importantly, the mode that is insensitive to the analyte environment exhibits good self-reference characteristics. Moreover, we discuss the case of exchanging the substrate material with the analyte environment. Promising simulation results show that this RI sensor can be widely deployed in unstable and complicated environments.
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Received: 24 May 2021
Revised: 30 June 2021
Accepted manuscript online: 12 July 2021
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PACS:
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42.25.Bs
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(Wave propagation, transmission and absorption)
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42.25.-p
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(Wave optics)
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42.79.-e
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(Optical elements, devices, and systems)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61865008). |
Corresponding Authors:
Xiangxian Wang
E-mail: wangxx869@lut.edu.cn
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Cite this article:
Jiankai Zhu(朱剑凯), Xiangxian Wang(王向贤), Yunping Qi(祁云平), and Jianli Yu(余建立) Plasmonic sensor with self-reference capability based on functional layer film composed of Au/Si gratings 2022 Chin. Phys. B 31 014206
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