Abstract
In order to achieve low refractive index detection in biomedical and material chemistry, a D-type microstructured optical fiber (MOF) sensor based on surface plasmon resonance (SPR) is proposed in this paper. The sensor uses gold nanofilm as sensing material between the core of the fiber and the plasma on the surface, and is coated at the open ring. Parametric analysis of the open-ring diameter, air hole diameter, and thickness of the gold nanofilm of the sensor was carried out by finite element method. The simulation results show that the sensor has a wavelength sensitivity of up to 10,900 nm/RIU, the refractive index range of 1.20–1.34, optimal resolution of 9.17 × 10−6 RIU, and a decent figure of merit (FOM) is 46.2 RIU−1. The proposed MOF-SPR sensor has high wavelength sensitivity and low resolution in a similar detection range compared to existing studies. The sensor is capable of detecting not only low refractive index substances, such as liquid medical oxygen with a refractive index of 1.22 and sevoflurane with a refractive index of 1.27, but also conventional refractive index substances such as water contamination with a refractive index near 1.33, providing a wide detection range. Therefore, the sensor is competitive in the detection of some low refractive index material detection fields.
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Data Availability
The datasets generated during the current study are not publicly available but are available from the corresponding author on reasonable request.
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Funding
This work was supported by the National Natural Science Foundation of China (Grant No. 61601183), the Natural Science Foundation of Henan Province, China (Grant No. 232300421391), the Key Technologies Research and Development Program of Henan Province, China (Grant No. 202102210390 and 222102210242), and Young Backbone Teachers in University of Henan Province, China (Grant No. 2020GGJS099).
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The manuscript was written with contributions from all authors. All authors have given approval to the final version of the manuscript. The detailed contributions of each co-author are as follows: conceived and designed the devices: Hua Wang and Jiangfei Zhao. Performed the numerical simulation: Xiaohu Yi, Pibin Bing, Zhiliang Chen, and Jingli Wang. Analyzed the data: Hua Wang, Jiangfei Zhao, Xiaohu Yi, Pibin Bing, Hailong Du. Drafted the manuscript: Hua Wang, Jiangfei Zhao, Xiaohu Yi, Zhiliang Chen, Jingli Wang. Revised the manuscript: Zhiliang Chen, Jingli Wang, and Hailong Du.
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Wang, H., Zhao, J., Yi, X. et al. A Low Refractive Index Microstructured Fiber Sensor with Wide Range Detection. Plasmonics 19, 327–334 (2024). https://doi.org/10.1007/s11468-023-01995-7
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DOI: https://doi.org/10.1007/s11468-023-01995-7