Journal of Guangxi Normal University(Natural Science Edition) ›› 2023, Vol. 41 ›› Issue (3): 31-40.doi: 10.16088/j.issn.1001-6600.2022061006

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Research on Refractive Index Sensing Based on Micro-nano Fiber Coupler

LING Zhanjun1, LI Hongtao1,2,3,4*, LU Hanglin4, FU Gurui1, HUANG Tianqi1,2,3, LÜ Liang1,2,3, YU Benli1,2,3   

  1. 1. School of Physics and Optoelectronics Engineering, Anhui University, Hefei Anhui 230601, China;
    2. Information Materials and Intelligent Sensing Laboratory of Anhui Province(Anhui University), Hefei Anhui 230601, China;
    3. Key Laboratory of Opto-Electronic Information Acquisition and Manipulation of Ministry of Education(Anhui University), Hefei Anhui 230601, China;
    4. Guangxi Key Laboratory of Nuclear Physics and Nuclear Technology(Guangxi Normal University), Guilin Guangxi 541004, China
  • Received:2022-06-10 Revised:2022-07-21 Online:2023-05-25 Published:2023-06-01

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Abstract: Although some conventional high-sensitivity optical microfiber couplers with ultra-thin diameter have been reported, the reported optical microfiber couplers with very fragile properties can pose great challenges in real sensing applications. In order to address the above problem, an optical microfiber coupler with a broad diameter of 6.25 μm was studied experimentally and theoretically. This optical microfiber coupler can achieve a high refractive-index sensitivity of-1 753 nm/RIU at the external refractive index (RI) of 1.339 8 with good stability. Based on finite element method (FEM), and effective indices of even/odd modes and refractive index sensitivity can be calculated. By this way, the proposed optical microfiber coupler can find proper applications in fiber-optic micro-fluidic biosensor and lab-on-a-chip multifunctional sensing.

Key words: optical fibers, coupler, refractive index sensitivity, finite element method, good stability

CLC Number:  TN253
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