基于等离子体共振效应的光纤表面等离子体共振传感器的理论研究

摘要

Based on the theory of Surface Plasmon Resonance( SPR) ,the technique of Surface Plasmon Resonance was de-scribed and a detailed mechanism of the Fiber-Optic sensing was discussed.The influence of the real and imaginary part of metal membrane’dielectric constant,the thickness of the metal,the refraction index of the fiber core and environment medium,and SPR reflective spectral properties were simulated by MATLAB.The main performance parameters of SPR sensors were respectively dis-cussed.Finally,based on the research of influential factor in inspiring SPR phenomenon and the change regularities of reflective spectrum with performance parameters,the feasibility of wavelength modulating SPR Sensors was discussed,which provided a the-oretic guide for improving the sensitivity and accuracy of Surface Plasmon Resonance( SPR) sensor and the optimization design of fiber SPR sensor system.%以等离子共振效应为基础，对等离子共振以及光纤传感的结构细节进行阐述，利用MATLAB软件模拟研究金属膜复介电常数虚部及实部、金属膜层厚度、光纤纤芯折射率、环境介质折射率对光纤表面等离子体共振反射谱性质的影响，对这些参数在性能特点上进行分别讨论，最后，在研究影响激发SP R现象因素和反射谱随性能参数变化规律的基础上，讨论了光纤SP R传感器波长调制型测量方法的可行性。从而为进一步提高表面等离子体共振传感器的灵敏度和检测精度以及光纤传感系统的优化设计提供理论指导。