With the incorporation of noble metal materials, photonic crystal fibers (PCFs) could be performed as an effective platform for refractive index sensing of the filling analytes. Furthermore, by coating functional dielectric layers upon the metal surfaces, the resonance energy transfer is modulated from the core mode of the PCFs towards the surface plasmon resonance mode of the metals, and the sensing performance could be boosted. Here, considering that the exciton-plasmon coupling is efficient between perovskite quantum dots (QDs) and gold, a kind of CsPbBr₃ QDs/Au bilayer coated triangular-lattice PCFs has been simulated numerically as the refractive index sensors. With the optimization of the QDs and gold layer thicknesses, together with the variation of the central hole size of the PCFs, in the refractive index (RI) region of 1.26 to 1.34, a rather narrow full width at half maximum (FWHM) of the loss spectra was achieved as 13.74nm when the central hole size was 1.28 µm and the highest figure of merit was 63.79RIU (the central hole size was 1.53 µm). This work demonstrates that the analyte identification accuracy was enhanced by FWHM narrowing of the loss spectra; in addition, taking the abundance of the material choice of perovskite QDs into consideration, more analytes could be detected effectively. Moreover, by adopting asymmetric structures, the sensitivity of the PCFs based refractive index sensors could be further improved.

随着贵金属材料的加入，光子晶体光纤 (PCF) 可以作为填充分析物的折射率传感的有效平台。此外，通过在金属表面涂覆功能性介电层，共振能量转移从 PCF 的核心模式向金属的表面等离子体共振模式进行调制，从而提高传感性能。这里，考虑到钙钛矿量子点（QD）和金之间的激子-等离子体耦合是有效的，一种CsPbBr ₃QDs/Au 双层涂覆的三角晶格 PCF 已作为折射率传感器进行了数值模拟。随着 QD 和金层厚度的优化，以及 PCF 中心孔尺寸的变化，在 1.26 至 1.34 的折射率（RI）区域内，半高全宽（FWHM）相当窄当中心孔尺寸为 1.28 µm 时，损耗光谱为 13.74nm，最高品质因数为 63.79RIU（中心孔尺寸为 1.53 µm）。这项工作表明，通过 FWHM 缩小损失光谱可以提高分析物识别的准确性；此外，考虑到钙钛矿量子点材料选择的丰富性，可以有效检测更多的分析物。此外，通过采用不对称结构，