A butterfly-shaped core photonic crystal fibers with less asymmetric rectangular and circular air holes are proposed, and their properties are numerically analyzed. The sensor construction is reduced to only seven air holes and uses surface plasmons stimulated inside gold (Au) strips for simplicity in manufacture and high sensitivity. Gold is employed as an effective plasmonic metal throughout this design to create resonant effects and is located away from the proposed structure to make production easier. Maximum amplitude sensitivity for the proposed sensor is 228.89 ${\mathrm{RIU}}^{-1}$, maximum wavelength sensitivity is 88,000 nm/RIU, and maximum wavelength resolution is 1.14 × 10⁻⁶ ${\mathrm{RIU}}^{-1}$ for y-polarized mode where the figure of merit is 65.78 RIU⁻¹ with a linearity of 0.9905. The proposed sensor can detect the RI of unspecified analytes between 1.27 and 1.40, allowing for the analysis of many different types of analytes, such as viruses, cancer cells, sugars, proteins, DNA/RNA and many more.

提出了一种具有较少不对称矩形和圆形气孔的蝶形纤芯光子晶体光纤，并对其性能进行了数值分析。传感器结构减少到只有七个气孔，并使用金 (Au) 条内部激发的表面等离子体，以简化制造并提高灵敏度。在整个设计中，金被用作有效的等离子体金属，以产生共振效应，并且远离提议的结构，以使生产更容易。所提议传感器的最大振幅灵敏度为 228.89${\mathrm{RIU}}^{-1}$，最大波长灵敏度为88,000 nm/RIU，最大波长分辨率为1.14 × 10 ^-6 ${\mathrm{RIU}}^{-1}$对于 y 偏振模式，品质因数为 65.78 RIU ⁻¹，线性度为 0.9905。所提出的传感器可以检测 1.27 至 1.40 之间的未指定分析物的 RI，从而可以分析许多不同类型的分析物，例如病毒、癌细胞、糖、蛋白质、DNA/RNA 等。