2021In this paper, we numerically design a refractive index-based surface plasmon fiber sensor by exploiting the optical characteristics of a commercially available side polished D-shaped photonic crystal fiber (PCF) using finite element method. The proposed sensor could work in the infrared regime for a wide range of analytes with refractive indices ranging from 1.33 to 1.36. The proposed sensor exhibits a maximum sensitivity of 31,800 nm/RIU with a resolution of 3.14×10-6 RIU when the refractive index is varied from 1.355 to 1.36. Further, considering the practical implementation, we carry out the fabrication tolerance of ± 5% of the proposed sensor by varying the optimized structural parameters. Based on the numerical results, we find that the proposed sensor is highly robust against the variations in the structural parameters. As the proposed fiber sensor has a strong surface plasmon resonance between the core mode and the surface plasmon mode, it is highly sensitive even for a minimum change in the refractive index of the analyte which is an attribute of high preference in biosensors.

中文翻译：

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紧凑型高灵敏度 D 形表面等离子体传感器

2021在本文中，我们利用有限元方法利用商用侧抛光D形光子晶体光纤（PCF）的光学特性，数值设计了一种基于折射率的表面等离子体光纤传感器。所提出的传感器可以在红外范围内工作，适用于折射率范围从 1.33 到 1.36 的各种分析物。当折射率从 1.355 到 1.36 变化时，所提出的传感器的最大灵敏度为 31,800 nm/RIU，分辨率为 3.14×10-6 RIU。此外，考虑到实际实施，我们通过改变优化的结构参数来实现所提出传感器的 ± 5% 的制造公差。基于数值结果，我们发现所提出的传感器对结构参数的变化具有高度鲁棒性。