This study presents an investigation on the performance of the sensitivity of a dual spider-shaped surface plasmon resonance (SPR)-based photonic crystal fibre (PCF) refractive index sensor having unique design specifications. To evaluate the fibre guiding properties, Finite Element Method is used for utilising the monetarily accessible COMSOL Multiphysics version 5.3a. A gold layer has been used as the plasmonic material surrounding the fibre to ensure chemical stability, and a single fine coating of TiO₂ supported the improvement of gold attachment with the fibre. The structural air holes' design arrangement inside the PCF gives an enhanced sensitivity performance. The proposed PCF-SPR gives extremely reduced confinement losses. Numerous precise investigations on the fibre parameters show the highest amplitude sensitivity of 4233 RIU⁻¹ in detecting the scope of the refractive index (RI) 1.32–1.41. 2.36 × 10⁻⁶ and 1.18 × 10⁻⁵ and are achieved as amplitude resolution and wavelength resolution, respectively. The highest confinement loss found for this sensor is recorded to be 6.22 dB/cm. The RI sensor can lead to the exact identification of organic chemicals and biological analytes for the proposed design specifications, providing good sensitivity with significantly reduced confinement loss.

中文翻译：

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基于双蜘蛛形表面等离子体共振的高振幅灵敏度折射传感器的设计

本研究对具有独特设计规格的基于双蜘蛛形表面等离子体共振 (SPR) 的光子晶体光纤 (PCF) 折射率传感器的灵敏度性能进行了调查。为了评估光纤引导特性，有限元方法用于利用经济上可用的 COMSOL Multiphysics 5.3a 版。金层已用作纤维周围的等离子体材料以确保化学稳定性，以及一层精细的 TiO _2涂层支持改善金与纤维的结合。PCF 内部的结构气孔设计布置提供了增强的灵敏度性能。拟议的 PCF-SPR 极大地减少了限制损失。对光纤参数的大量精确研究表明，在检测折射率 (RI) 1.32–1.41 范围时，4233 RIU ^{-1的最高振幅灵敏度。}2.36 × 10 ^-6和 1.18 × 10 ^-5分别作为振幅分辨率和波长分辨率实现。该传感器的最高限制损耗记录为 6.22 dB/cm。RI 传感器可以根据建议的设计规范准确识别有机化学品和生物分析物，提供良好的灵敏度并显着减少限制损失。