基于高双折射侧边抛磨光子晶体光纤的表面等离激元共振双参量传感器  

Surface plasmon resonance dual parameter sensor based onhigh birefringence side polishing photonic crystal fibers

作　　者：裴俊凯 周青春 王颖 PEI Junkai;ZHOU Qingchun;WANG Ying(School of Science,Jiangsu University of Science and Technology,Zhenjiang 212100,China)

机构地区：[1]江苏科技大学理学院,镇江212100

出　　处：《江苏科技大学学报（自然科学版）》2024年第1期111-118,共8页Journal of Jiangsu University of Science and Technology:Natural Science Edition

基　　金：国家自然科学基金项目(11791240178)。

摘　　要：利用表面等离激元共振(SPR)技术设计了一款高双折射光子晶体光纤(PCF)传感器,可以实现宽范围的双参量高灵敏度传感.采用侧边抛磨的结构,内部空气孔呈三角晶格排列.金纳米层涂覆在抛磨面直接与待测物接触作为测量折射率RI的通道,更加方便检测工作的进行,靠近纤芯的椭圆孔内充满氯仿用来探测温度.两个独立的通道以及由非对称引入的双折射可以确保独自测量折射率和温度的变化,解决了交叉灵敏度问题.借助全矢量有限元软件COMSOL Multiphysics,灵活使用散射边界条件可以很好的对光子晶体光纤传感器的光学特性进行数值分析研究.实验结果表明,文中提出的传感器可以测量折射率范围为1.32~1.39,温度范围是20~60℃,在500~1100 nm的波长范围内可以观察到明显的表面等离激元共振效应.为了进一步分析该结构的性能,对主要结构参数(抛光面金膜厚度m_(1)、Ta_(2)O_(5)厚度m_(2)、中心空气孔直径d1以及占空比)做了研究分析.仿真结果得到折射率传感下的平均波长灵敏度5700 nm/RIU,最大波长灵敏度13200 nm/RIU,最大振幅灵敏度818.44 RIU^(-1),传感器的折射率分辨率为1.75×10^(-5)RIU.温度传感范围为20~60℃,得到最大波长灵敏度为2.6 nm/℃,最大振幅灵敏度为0.363℃-1,以及传感器的温度分辨率为3.84×10^(-2)℃.该工作对于高灵敏度、实时、分布式、多参量测量SPR传感器的设计和实现具有指导意义.A high-birefringence photonic crystal fiber sensor is designed using surface plasmon resonance technology,which can realize a wide range of dual-parameter high-sensitivity sensing.The structure is polished on the side,and the internal air holes are arranged in a triangular lattice.The gold nano layer is coated on the polishing surface and directly contacts the object to be measured as a channel for measuring the refractive index,which is more convenient for the detection work.The oval hole near the fiber core is filled with chloroform to detect the temperature.Two independent channels and the birefringence introduced by asymmetry can ensure independent measurement of refractive index and temperature changes,which solves the problem of cross sensitivity.With the help of the full-vector finite element software COMSOL Multiphysics,the flexible use of scattering boundary conditions can perform numerical analysis and research on the optical characteristics of photonic crystal fiber sensor.The experimental results show that the sensor proposed in this paper can measure the refractive index range of 1.32~1.39,the temperature range of 20~60℃,and the obvious surface plasmon resonance effect can be observed in the wavelength range of 500~1100 nm.In order to further analyze the performance of the structure,the main structural parameters(gold film thickness m_(1),Ta_(2)O_(5) thickness m_(2),central air hole diameter d 1,and duty cycle)are studied and analyzed.The simulation results show that the average wavelength sensitivity of refractive index sensing is 5700nm/RIU,the maximum wavelength sensitivity is 13200nm/RIU,the maximum amplitude sensitivity is 818.44RIU^(-1),and the refractive index resolution of the sensor is 1.75×10^(-5) RIU.The temperature sensing range is 20~60℃,the maximum wavelength sensitivity is 2.6nm/℃,the maximum amplitude sensitivity is 0.363℃-1,and the temperature resolution of the sensor is 3.84×10^(-2)℃.This work has guiding significance for the design and implementation of high-sensitivity

关 键 词：光子晶体光纤 表面等离激元共振 高双折射 折射率传感 温度传感 

分 类 号：O441.6[理学—电磁学]