A gold-coated D-shape photonic crystal fibre sensor based on surface plasmon resonance (PCF-SPR) is designed with microfluidic channels and numerically investigated for detection of a wide range of refractive indexes. The D-type structure and microfluidic channels improve the performance of the sensor by reducing the distance between the core and channel and increasing the coupling strength of the fundamental and plasmonic modes. By optimizing the structural parameters, the PCF-SPR sensor can realize a broad range of detection for low RIs changing from 1.23 to 1.36. The maximum spectral sensitivity of 18,000 nm/RIU and optimal resolution of 5.56 × 10⁻⁶ RIU are observed for RIs between 1.35 and 1.36. The sensor is capable of detecting analytes with RIs below 1.36 and has great potential in medical diagnosis, drug development, food safety, and water testing.

基于表面等离子体共振 (PCF-SPR) 的镀金 D 形光子晶体光纤传感器设计有微流体通道，并进行了数值研究，用于检测各种折射率。D型结构和微流体通道通过减少核心和通道之间的距离并增加基模和等离子体模式的耦合强度来提高传感器的性能。通过优化结构参数，PCF-SPR传感器可以实现对低RIs从1.23到1.36变化的大范围检测。最大光谱灵敏度为 18,000 nm/RIU，最佳分辨率为 5.56 × 10 ^-6对于 1.35 和 1.36 之间的 RI，观察到 RIU。该传感器能够检测 RI 低于 1.36 的分析物，在医学诊断、药物开发、食品安全和水质检测等方面具有巨大潜力。