Superfine multiresonant fiber grating sensors assisted with silica capillaries  

作　　者：KAIWEI LI YONGGUANG XIAO FU LIU ZHIYONG YANG XIANGYU YAN ZHAOHUI LI TUAN GUO GAOZHI GEORGE XIAO JACQUES ALBERT 

机构地区：[1]Key Laboratory of Bionic Engineering(Ministry of Education),Jilin University,Changchun 130022,China [2]Institute of Photonics Technology,Jinan University,Guangzhou 510632,China [3]School of Electrical and Information Technology,Sun Yat-sen University,Guangzhou 510006,China [4]Department of Electronics,Carleton University,Ottawa,Ontario K1S 5B6,Canada [5]National Research Council Canada,Ottawa,Ontario K1A 0R6,Canada

出　　处：《Photonics Research》2024年第11期2488-2494,共7页光子学研究(英文版)

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[2023]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。

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.

关 键 词：FIBER RESONANT SILICA 

分 类 号：TN2[电子电信—物理电子学]