Long Period Grating Imprinted on a Flat-Shaped Plastic Optical Fiber for Refractive Index Sensing
作者机构：State Key Laboratory of Integrated OptoelectronicsCollege of Electronic Science and EngineeringJilin UniversityChangchun 130012China Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130012China
出 版 物：《Photonic Sensors》 (光子传感器（英文版）)
年 卷 期：2023年第13卷第4期
页 面：39-49页
核心收录：
学科分类：08[工学] 080202[工学-机械电子工程] 0804[工学-仪器科学与技术] 0802[工学-机械工程] 0702[理学-物理学]
主 题：Plastic optical fiber fiber optic sensor flat-shaped optical fiber long period grating refractive index sensing
摘 要：A corrugated surface long period grating(LPG)was fabricated on a flat-shaped plastic optical fiber(POF)as a refractive index(RI)sensor by a simple pressing with the heat pressure and mechanical die press print method.The light propagation characteristics of an LPG imprinted on a multi-mode POF were analyzed by the method of geometrical optics.Theoretical and experimental results showed that the structural parameters of the sensor affected the RI sensing performance,and the sensor with a thinner flat thickness,a deeper groove depth of the corrugated surface LPG,and a longer LPG exhibited better RI sensing performance.When the POF with a diameter of 1 mm was pressed with the heat pressure to a flat shape with a thickness of 600μm,an LPG with a period of 300μm,a groove depth of 200μm,and a length of 6 cm was fabricated on it,and the RI sensitivity of 1447%/RIU was obtained with a resolution of 5.494×10^(−6) RIU.In addition,the influences of the POF cladding,tilting of LPG,and bending of the sensing structure were investigated.The results demonstrated that after removing the cladding and tilting or bending the LPG,the RI sensing performance was improved.When the LPG imprinted on the flat-shaped POF was bent with a curvature radius of 6/πcm,the highest sensitivity of 6563%/RIU was achieved with a resolution of 2.487×10^(−9) RIU in the RI range of 1.3330–1.4230.The proposed sensor is a low-cost solution for RI measurement with the features of easy fabrication,high sensitivity,and intensity modulation at the visible wavelengths.
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