倾斜光纤光栅结合SPR效应折射率传感范围研究  

Research on Refractive Index Sensing Range of Tilted Fiber Bragg Grating Combined with SPR Effect

作　　者：窦紫伟 张荣[1] 孔梅[1] DOU Ziwei;ZHANG Rong;KONG Mei(School of Physics,Changchun University of Science and Technology,Changchun 130022)

机构地区：[1]长春理工大学物理学院,长春130022

出　　处：《长春理工大学学报（自然科学版）》2024年第6期51-55,共5页Journal of Changchun University of Science and Technology(Natural Science Edition)

摘　　要：倾斜光纤光栅(TFBG)结合表面等离激元谐振(SPR)现象,可以实现对外界折射率的高精度传感。这一组合不仅可以提高传感的灵敏度,还可以拓宽传感范围,目前TFBG-SPR传感器的研究集中于对生物物质、气体、化学成分等检测的具体应用。TFBG-SPR传感器的传感范围与光栅倾角有关,不同的倾角会改变光栅内部的光波导模式分布,进而影响到SPR效应的激发条件及其对外界折射率变化的响应范围。实际应用中TFBG倾角与传感范围的关系还不明确。本文给出了结合理论和仿真计算分析不同倾角TFBG-SPR传感范围的方法,用5°倾角TFBG-SPR传感器进行了折射率传感的实验验证,对TFBG-SPR传感器的设计有重要参考意义。Tilted fiber Bragg grating(TFBG)combined with surface plasmon resonance(SPR)effect can achieve highprecision sensing of external refractive index.This combination can not only enhance the sensitivity of sensing but can also broaden the sensing range.Currently,research on TFBG-SPR sensors focuses on specific applications for the detection of biomaterials,gases,chemical components,and more.The sensing range of the TFBG-SPR sensor is related to the tilt angle of the grating.Different tilt angles can change the distribution of optical waveguide modes within the grating,thereby affecting the excitation conditions of the SPR effect and its response range to changes in external refractive index.The relationship between the TFBG tilt angle and the sensing range in practical applications is not yet clear.Inthis paper,we provide a method of analyzing the sensing range of TFBG-SPR with different tilt angles by combing relative theory and tilt angle simulation.Refractive index sensing experimentby a TFBG-SPR sensor with 5°tilt angle is carried out and verified our method.The work of this paper has important reference significance for the design of TFBG-SPR sensors.

关 键 词：倾斜光纤光栅 表面等离激元共振 折射率传感 传感范围 

分 类 号：O439[机械工程—光学工程]