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Hollow-core graded index optical fiber refractive index sensor based on surface plasmon resonance
Optical and Quantum Electronics ( IF 3 ) Pub Date : 2020-07-01 , DOI: 10.1007/s11082-020-02461-y
Ruhallah Nasirifar , Mohammad Danaie , Abbas Dideban

In this paper, a novel topology for refractive index optical fiber sensors based on surface plasmon resonance (SPR) phenomenon is presented. The fiber core has a graded refractive index and there is a hole at the center of the core which is coated by silver. The analyte is injected into the hole. In our structure, there is no need for removing the cladding of the fiber. Two types of graded refractive index profiles are investigated in this paper. The proposed sensor is simulated using finite difference time domain method. The results show that the presented SPR sensor has a good spectral response and suitable sensory specifications. The sensitivity of the proposed sensor is about 4350 nm/RIU. The figure of merit of this sensor is 149 RIU −1 . The proposed sensor can be used for measuring refractive indices between 1.38 and 1.49. As a result, it can be used for bio-sensing applications. One of the advantages of the proposed sensor is that it is label-free.

中文翻译:

基于表面等离子体共振的空心渐变折射率光纤折射率传感器

在本文中,提出了一种基于表面等离子体共振 (SPR) 现象的折射率光纤传感器的新型拓扑结构。纤芯具有渐变折射率,纤芯中心有一个镀银孔。分析物被注入孔中。在我们的结构中,不需要去除光纤的包层。本文研究了两种类型的渐变折射率分布。所提出的传感器使用有限差分时域方法进行仿真。结果表明,所提出的 SPR 传感器具有良好的光谱响应和合适的感官规格。所提出的传感器的灵敏度约为 4350 nm/RIU。该传感器的品质因数为149 RIU -1 。建议的传感器可用于测量介于 1.38 和 1.49 之间的折射率。因此,它可用于生物传感应用。所提出的传感器的优点之一是它是无标签的。
更新日期:2020-07-01
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