College of Science, University of Shanghai for Science and Technology, Shanghai 200093, China.
Shanghai Key Laboratory of Modern Optical System, University of Shanghai for Science and Technology, Shanghai 200093, China.
Sensors (Basel). 2019 Oct 8;19(19):4345. doi: 10.3390/s19194345.
A simple hetero-core optical fiber (MMF-NCF-MMF) surface plasmon resonance (SPR) sensing structure was proposed. The SPR spectral sensitivity, full width of half peak (FWHM), valley depth (VD), and figure of merit (FOM) were defined to evaluate the sensing performance comprehensively. The effect of gold film thickness on the refractive index and temperature sensing performance was studied experimentally. The optimum gold film thickness was found. The maximum sensitivities for refractive index and temperature measurement were obtained to be 2933.25 nm/RIU and -0.91973 nm/°C, respectively. The experimental results are helpful to design the SPR structure with improved sensing performance. The proposed SPR sensing structure has the advantages of simple structure, easy implementation, and good robustness, which implies a broad application prospect.
提出了一种简单的异核光纤（MMF-NCF-MMF）表面等离子体共振（SPR）传感结构。定义了 SPR 光谱灵敏度、半峰全宽（FWHM）、谷深度（VD）和品质因数（FOM），以全面评估传感性能。实验研究了金膜厚度对折射率和温度传感性能的影响。找到了最佳的金膜厚度。获得的折射率和温度测量的最大灵敏度分别为 2933.25nm/RIU 和-0.91973nm/°C。实验结果有助于设计具有改进传感性能的 SPR 结构。所提出的 SPR 传感结构具有结构简单、易于实现和良好的鲁棒性等优点，具有广阔的应用前景。
