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.

摘要

设计并证明了基于具有六边形结构和外部金涂层的表面等离子共振（SPR）的光子晶体光纤（PCF）传感器，具有宽广的检测范围和超高灵敏度。由于惰性和稳定的化学特性，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。感测特性通过有限元方法（FEM）进行分析。在此传感器中，具有大模式场面积的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，宽泛的分析物折射率（RI）范围从1.28至1.43，分辨率3.48×10 ^-6 RIU，最大幅度灵敏度为2481.06 RIU ^-1。此外，传感器的典范品质因数和信噪比分别为517.81 RIU ^-1和5.18。