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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。
In order to improve the design method of the fiber surface plasmon resonance sensor, in the MATLAB environment, based on the theory of thin film optics, the imaginary part, the real part, the thickness of the film, the refractive index of the fiber core and the medium refractive index The parameters are used to establish the numerical calculation model, and the influence of each of them on the reflection spectrum of the fiber surface plasmon resonance sensor head is discussed and discussed. The experiment is used to verify the numerical results. Given the structural parameters of the optical fiber and the thin film of the sensor head, it is possible to observe effective measurement ranges of a plurality of surface plasmon resonance points and different refractive indices of the environment medium within a range of refractive index change of a larger environmental medium, , Film thickness has different critical value requirements. This provides a theoretical guide to optimizing the measurement scheme for a wavelength-modulated optical fiber SPR sensor.