Abstract
A highly sensitive photonic crystal fiber temperature sensor based on Sagnac interferometer with full liquid filling is proposed. All of the air holes in the PCF are filled with temperature-sensitive liquid, the structure is analyzed theoretically and numerically using the finite element method. Since the sensitivity is related to the group birefringent grating, the size of the sensitivity can be reflected by comparing the absolute value of the group birefringent grating. The structure is optimized by modifying the diameter of d0, d1 and d2 of the air holes for the photonic crystal fiber. In the process of numerical calculation, the best parameters are selected by comparing the absolute value of the group birefringent grating near the special wavelength to obtain higher sensitivity. The average sensitivity of 35.14 nm/°C and − 27.71 nm/°C are obtained at 27–32 °C in a parametrically optimized structure and R2 are 0.98455 and 0.9779. The RI sensitivity is also studied as RI changes from 1.404 to 1.409, the average sensitivity are − 53,714 nm/RIU and − 47,714.29 nm/RIU.
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Funding
The work is supported by the Natural Science Foundation of Hebei Province (Grant No. A2020208005), the Hebei University of Science and Technology Talent Introduction Project (Grant No. PYB2018016), and the Science and Technology Project of Hebei Education Department (Grant No. BJ2018040).
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Design, analysis, and investigation: YP Zhang, Writing—original draft preparation: SC Chu, Writing—review and editing: XQ Zhang, Supervision: ZK Fan. XQ Zhang and ZK Fan have the equal contributions in work.
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Zhang, Y., Zhang, X., Chu, S. et al. A highly sensitive photonic crystal fiber temperature sensor based on Sagnac interferometer with full liquid filling. Opt Quant Electron 55, 371 (2023). https://doi.org/10.1007/s11082-023-04669-0
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DOI: https://doi.org/10.1007/s11082-023-04669-0