Superfine multiresonant fiber grating sensors assisted with silica capillaries
作者机构：Key Laboratory of Bionic Engineering (Ministry of Education) Jilin University Institute of Photonics Technology Jinan University School of Electrical and Information Technology Sun Yat-sen University Department of Electronics Carleton University National Research Council Canada
出 版 物：《Photonics Research》 (光子学研究)
年 卷 期：2024年第12卷第11期
页 面：2488-2494页
核心收录：
学科分类：080202[工学-机械电子工程] 08[工学] 0802[工学-机械工程]
基 金：National Natural Science Foundation of China(52375288, 61975068, 62035006) National Science and Engineering Research Council of Canada (RGPIN-2019-06255) Program of Marine Economy Development Special Fund under the Department of Natural Resources of Guangdong Province (GDNRC 23) Basic and Applied Basic Research Foundation of Guangdong Province (2022A1515010235) Open Fund of Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communication Technology
主 题：Effective refractive index Fiber Bragg gratings Fiber optic sensors Microstructured fibers Multicore fibers Multimode fibers
摘 要：We propose and demonstrate a superfine multiresonant fiber grating sensor characterized by superior spectral resolution and enhanced sensing capabilities. This sensor can be easily constructed by inserting a tilted fiber Bragg grating(TFBG) probe into a silica capillary filled with a refractive index(RI) matching oil. As the fiber cladding,the RI-matching oil, and the capillary all have the same RI, the cladding modes excited by the TFBG can extend into the RI-matching oil and capillary, facilitating surface sensing outside the capillary. Our study shows that the number of cladding modes increases, and the resonance spectrum becomes denser as the outer diameter of the capillary gets larger. As a result, the detection accuracy of RI based on mode cutoff wavelength identification can be improved. Particularly, with a capillary diameter of 1 mm, the heightened spectral density enhances refractometric accuracy by nearly an order of magnitude compared to the intrinsic TFBG. The superfine multiresonant fiber grating sensor proposed here is flexible in configuration and easy to fabricate, providing a new strategy for developing new fiber sensing devices. ? 2024 Chinese Laser Press
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