基于薄膜光学理论的光纤表面等离子共振传感器研究  

Investigation on SPR fiber-optic probes based on thin film optics

作　　者：付丽辉[1,2] 尹文庆[2] 戴峻峰[1] 

机构地区：[1]淮阴工学院自动化学院,淮安223003 [2]南京农业大学工学院,江苏省智能化农业装备重点实验室,南京210031

出　　处：《分析试验室》2016年第10期1171-1176,共6页Chinese Journal of Analysis Laboratory

基　　金：星火计划项目(2013GA690405);江苏省普通高校研究生科研创新计划项目(CXLX12_0277);江苏省教育厅自然基金项目(13KJD510002)资助

摘　　要：为完善光纤表面等离子共振传感器设计方法,在MATLAB环境下,基于薄膜光学理论,以金属薄膜复介电常数的虚部、实部、膜层厚度、光纤纤芯折射率、环境介质折射率为中间参量建立数值计算模型,研究讨论了各自对光纤表面等离子体共振传感头反射谱的影响。利用实验对数值计算结果进行验证。给定传感头的光纤与薄膜结构参数,在较大的环境介质折射率折变化范围内,可能观测到多个表面等离子共振点,环境介质折射率不同的有效测量范围,对纤芯折射率、薄膜厚度有着不同的临界取值要求。这可为波长调制型光纤SPR传感器测量方案优化,提供相应理论指导。A numerical computaton model was set up to improve the design method of the fiber surface plasmon resonance sensor in the MATLAB environment based on the thin film optics theory with the intermediate parameters of the imaginary and real part of the complex dielectric constant of the metal film,the film thickness,the refractive index of the fiber core and the environmental medium. The effects of those intermediate parameters on the reflection spectrum of optical fiber surface plasmon resonance sensing head were discussed. The numerical results were verified by the experiment. Results showed that with the known parameters of the optical fiber of sensing head and the film structure,in the larger refractive index of the environmental medium,multiple surface plasmon resonance point may be observed in the effective measurement range of different refractive index of environmental medium. The refractive index of the fiber core rate and film thickness have different critical value requirements,which can provide corresponding theoretical guidance for optimizing the measurement scheme of wavelength modulation optical fiber SPR sensor.

关 键 词：光纤传感器 表面等离子共振效应 薄膜光学 数值计算仿真 MATLAB 

分 类 号：TM452[电气工程—电器] TN253[电子电信—物理电子学]