Abstract A novel photonic crystal fiber (PCF) sensor composed of an indium tin oxide (ITO) coating on the outer surface based on surface plasmon resonance (PCF-SPR) is designed and investigated. The sensor consists of eight air holes arranged in a rectangular grid as the cladding, the ITO layer as the plasmonic materials, and an annular external channel. The finite element method (FEM) is used to study the sensing performance and effects of different geometric parameters. The sensor can be operated in the near-infrared region (1380–2260 nm) for the analyte refractive index range between 1.26 and 1.38. In addition, the sensor shows a maximum wavelength sensitivity of 35000 nm/RIU and amplitude sensitivity of 1120.73 RIU−1. It has good wavelength and amplitude resolution reaching 2.86 × 10−6 RIU and 8.92 × 10−6 RIU, respectively and is suitable for accurate sensing applications in biomedicine and chemistry.

中文翻译：

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基于氧化铟锡薄膜光子晶体光纤的表面等离子体共振传感器

摘要 设计并研究了一种新型光子晶体光纤 (PCF) 传感器，该传感器由基于表面等离子体共振 (PCF-SPR) 的外表面氧化铟锡 (ITO) 涂层组成。该传感器由布置在矩形网格中的八个气孔作为包层、ITO 层作为等离子体材料和一个环形外部通道组成。有限元法（FEM）用于研究不同几何参数的传感性能和影响。传感器可以在近红外区域 (1380–2260 nm) 中操作，分析物的折射率范围在 1.26 和 1.38 之间。此外，该传感器的最大波长灵敏度为 35000 nm/RIU，幅度灵敏度为 1120.73 RIU-1。它具有良好的波长和幅度分辨率，分别达到 2.86 × 10−6 RIU 和 8.92 × 10−6 RIU，