Refractive Index Sensing through Surface Plasmon Resonance in Light-Diffusing Fibers
Refractive Index Sensing through Surface Plasmon Resonance in Light-Diffusing Fibers
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DOI：
10.3390/app8071172
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发表时间：
2018-07-01
影响因子：
2.7
通讯作者：
Minardo, Aldo
中科院分区：
文献类型：
--
作者：
Cennamo, Nunzio;Zeni, Luigi;Minardo, Aldo
在本文中，我们表明，光扩散光纤（LDF）可以有效地用作主体材料的表面等离子体共振（SPR）为基础的折射率传感。这种新型平台不需要化学过程来去除包层或增强倏逝场，这有望提供更好的传感界面再现性。SPR传感器的实现是先用简单的机械剥离器去除光纤包层，然后在未包层的光纤表面覆盖一层金薄膜。使用折射率范围为1.332至1.394的水-甘油混合物进行了测试。实验结果表明，SPR波长对外部介质的折射率具有很高的灵敏度，在分析范围内，其值范围从近似1500 nm/RIU到近似4000 nm/RIU。结果表明，所提出的光纤传感器平台可以用于生物化学应用。
In this paper, we show that light-diffusing fibers (LDF) can be efficiently used as host material for surface plasmon resonance (SPR)-based refractive index sensing. This novel platform does not require a chemical procedure to remove the cladding or enhance the evanescent field, which is expected to give better reproducibility of the sensing interface. The SPR sensor has been realized by first removing the cladding with a simple mechanical stripper, and then covering the unclad fiber surface with a thin gold film. The tests have been carried out using water-glycerin mixtures with refractive indices ranging from 1.332 to 1.394. The experimental results reveal a high sensitivity of the SPR wavelength to the outer medium's refractive index, with values ranging from similar to 1500 to similar to 4000 nm/RIU in the analyzed range. The results suggest that the proposed optical fiber sensor platform could be used in biochemical applications.