Abstract A surface plasmon resonance (SPR) refractive index (RI) sensor based on a D-shaped Hi-Bi photonic crystal fiber (PCF) is investigated with finite element method. Through changing the asymmetry of the fiber core along x- and y- axis, it is found that the Hi-Bi structure can greatly enhance the plasmon resonance at near-infrared wavelength, thus effectively reducing the FWHM. Benefiting from this, the designed sensor can provide higher FOM than other works previously reported. In addition, from the design and optimization of sensor structure and material, it is found that compared with the refractive index of the material, the structure has little influence on the sensitivity of the sensor, but can effectively improve the resonance intensity of SPR, which has certain guiding significance for the design and optimization of such PCF SPR sensors in the future.

中文翻译：

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基于D形Hi-Bi光子晶体光纤的表面等离子体共振传感器

摘要 采用有限元方法研究了一种基于D形Hi-Bi光子晶体光纤(PCF)的表面等离子体共振(SPR)折射率(RI)传感器。通过改变纤芯沿 x 轴和 y 轴的不对称性，发现 Hi-Bi 结构可以大大增强近红外波长的等离子体共振，从而有效地降低 FWHM。受益于此，设计的传感器可以提供比以前报道的其他作品更高的 FOM。此外，从传感器结构和材料的设计和优化发现，与材料的折射率相比，该结构对传感器的灵敏度影响不大，但可以有效提高SPR的共振强度，