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Highly sensitive magnetic field sensor based on mode coupling effect in microstructured optical fibers

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Abstract

A highly sensitive magnetic field sensor based on mode coupling effect in a microstructured optical fiber (MOF) was theoretically investigated by using the finite element method. Magnetic fluid with refractive index higher than silica was designed to be filled into one cladding air hole in MOF to form a defect core. The coupling wavelength between fiber core modes and defect core modes can be modulated by external magnetic field. Simulation results show that the measuring sensitivity of magnetic field and figure of merit reached 1620 pm/Oe, 0.081/Oe in x-polarized mode and 1790 pm/Oe, 0.045/Oe in y-polarized mode, respectively. Meanwhile, the intensity of magnetic field depicts a good linear relationship with the coupling wavelength for both orthogonal polarized directions in the range of 25–175.9 Oe. The performance of the designed magnetic field sensor can be improved by optimizing the structural parameters in MOF.

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Acknowledgements

This project was supported by the Natural Science Foundation of Hebei Province,China (Grant Nos. F2017203110, F2017203193), the National Natural Science Foundation of China (Grant No. 61505175) and the China Scholarship Council (Grant No. 201908130229).

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Authors and Affiliations

  1. State Key Laboratory of Metastable Materials Science and Technology and Key Laboratory for Microstructural Material Physics of Hebei Province, School of Science, Yanshan University, Qinhuangdao, 066004, People’s Republic of China

    Wenxun Zhang, Hailiang Chen, Yingchao Liu, Mingjian Ma & Shuguang Li

  2. School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, 639798, Singapore

    Hailiang Chen

  3. CINTRA CNRS/NTU/THALES, UMI 3288, Research Techno Plaza, 50 Nanyang Drive, Singapore, 637553, Singapore

    Hailiang Chen

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  1. Wenxun Zhang
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  2. Hailiang Chen
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  3. Yingchao Liu
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  4. Mingjian Ma
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  5. Shuguang Li
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Correspondence to Hailiang Chen.

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This article is part of the Topical Collection on Optical Wave and Waveguide Theory and Numerical Modelling.

Guest edited by Alejandro Ortega Moñux, Rafael Godoy Rubio and Jiri Ctyroky.

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Zhang, W., Chen, H., Liu, Y. et al. Highly sensitive magnetic field sensor based on mode coupling effect in microstructured optical fibers. Opt Quant Electron 52, 133 (2020). https://doi.org/10.1007/s11082-020-2206-0

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  • DOI: https://doi.org/10.1007/s11082-020-2206-0

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