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研究了一种基于波分复用原理的准分布式光纤表面等离子体波传感器。应用光波导理论和多层膜反射理论分析了表面等离子体波效应在同一光纤探头中连续被激励的原理及其传感模型。通过数值模拟和相应实验分别考察了蒸镀调制层对表面等离子体波共振(SPR)效果的影响,并在此基础上给出了设计的一般步骤和原则。实验结果表明,蒸镀不同厚度的Ta2O5薄膜将导致表面等离子体波共振光谱发生偏移,且随着膜厚增加而逐渐发生红移;当液体折射率n0处于1.333~1.388之间时,蒸镀有Ta2O5薄膜的光纤表面等离子体波传感器波长灵敏度达到2235 nm/RIU(Refractive Index Unit);通过在一支光纤探头上依次加工两个表面等离子体波传感区域,实现了对光波信号的连续调制。
A quasi-distributed fiber surface plasmon wave sensor based on the principle of wavelength division multiplexing is studied. The theory of optical waveguide and multilayer film reflection theory are used to analyze the principle and sensing model of the surface plasmon wave effect continuously excited in the same fiber probe. The effects of vapor deposition layer on surface plasmon resonance (SPR) were investigated by numerical simulation and corresponding experiments respectively. Based on this, the general design steps and principles were given. The experimental results show that evaporation of Ta2O5 films with different thicknesses will lead to the shift of the surface plasmon resonance spectrum and gradually red shift with the increase of film thickness. When the refractive index n0 of liquid is between 1.333 and 1.388, The wavelength sensitivity of the optical fiber surface plasmon wave sensor with Ta2O5 film reaches 2235 nm / RIU (Refractive Index Unit). By successively processing two surface plasmon wave sensing areas on one optical fiber probe, continuous modulation of the light wave signal is realized .