Abstract
A novel refractive index (RI) sensor based on a D-shaped single-mode-graded-index multimode-single-mode fiber (D-SGIMS) structure is presented and investigated in detail. A CO2 laser was used to process the SGIMS structure, which produced a strong evanescent field. The structural parameters were determined via simulations, and the experimental results were consistent with those of the theoretical analysis. The transmission spectra and RI sensitivity of the fabricated sensors with different lengths were compared via experiments, the results of which indicated that the maximum RI sensitivity was 811.00 nm/RIU in the range 1.333–1.419. Therefore, the proposed D-SGIMS structure can provide high-precision measurement capabilities and can be applied in the field of biochemistry.
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Acknowledgements
This work was funded by the Joint Research Fund in Astronomy under cooperative agreement between the National Natural Science Foundation of China (NSFC) and Chinese Academy of Sciences (CAS) under No. U1831115, U2031132, U1931206 and U2031130. Natural Science Foundation of Heilongjiang Province (ZD2019H003). The Fundamental Research Funds for the Central Universities to the Harbin Engineering University under No. 3072022QBZ2505. High level research guidance Special 3072022JC2501.
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ZIHANG XIANG wrote the manuscript and performed the experiments. ZEJU RUI, CHUPENG LU and FEI ZENG prepared figures. SHENGJIA WANG and CHUPENG LU Polished the English. YIFEI WANG, CUITING SUN, XIREN JIN, SONG LI and TAO GENG checked the manuscript.
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Xiang, Z., Lu, C., Wang, S. et al. Highly sensitive RI sensor based on a D-shaped single-mode-graded-index multimode-single-mode fiber structure. Appl. Phys. B 129, 21 (2023). https://doi.org/10.1007/s00340-022-07967-9
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DOI: https://doi.org/10.1007/s00340-022-07967-9