ABSTRACT A photonic crystal fibre (PCF) sensor based on surface plasmon resonance (SPR) with a hexagonal structure and external gold coating is designed and demonstrated to have a broad detection range and ultra-high sensitivity. Gold is chosen as the plasmonic materials due to the inert and stable chemical properties and the gold coating on the PCF-SPR sensor also simplifies the detection and fabrication processes. The sensing properties are analysed by the finite element method (FEM). In this sensor, the y-polarized mode with the large mode field area shows better performance such as the high spectral sensitivity of 28,700 nm/RIU, wide analyte refractive index (RI) range from 1.28 to 1.43, resolution of 3.48×10-6 RIU, and maximum amplitude sensitivity of 2481.06 RIU−1. Furthermore, the paragon figure of merit and signal-to-noise ratio of the sensor are 517.81 RIU−1 and 5.18, respectively.

中文翻译：

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具有广泛检测范围的超灵敏六边形 PCF-SPR 传感器

摘要设计了一种基于表面等离子体共振 (SPR) 的光子晶体光纤 (PCF) 传感器，具有六边形结构和外部镀金层，并证明其具有广泛的检测范围和超高灵敏度。由于惰性和稳定的化学性质，金被选为等离子体材料，PCF-SPR 传感器上的金涂层也简化了检测和制造过程。传感特性通过有限元方法 (FEM) 进行分析。在该传感器中，具有大模场面积的y偏振模式显示出更好的性能，例如28,700 nm / RIU的高光谱灵敏度，1.28至1.43的宽分析物折射率（RI）范围，3.48×10-6的分辨率RIU，最大振幅灵敏度为 2481.06 RIU-1。此外，