A new type of highly sensitive near-infrared birefringent six-core photonic crystal fibre sensor using surface plasmon resonance (SPR) is proposed. By using the full-vector finite element method, the impacts of the fibre parameters on the wavelength sensitivity and amplitude sensitivity are numerically studied. The numerical results indicate that, benefiting from the high birefringent multi-core fibre structure, an average sensitivity of 8083 nm/refractive index unit (RIU) within the wavelength range from 1.532 to 2.02 µm is achieved when the analyte refractive index (RI) lies in (1.372, 1.432). Moreover, the maximum amplitude sensitivity is as high as 226 RIU−1 if the analyte RI is adjusted from 1.372 to 1.382. In consideration of its excellent sensing performance, the proposed SPR multi-core PCF sensor can be applied in environmental, food safety, and (bio)chemical detection.

中文翻译：

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基于双折射六芯光子晶体光纤的高灵敏度近红外表面等离子体共振（SPR）传感器

提出了一种使用表面等离子体共振（SPR）的新型高灵敏度近红外双折射六芯光子晶体光纤传感器。采用全矢量有限元方法，数值研究了光纤参数对波长灵敏度和幅度灵敏度的影响。数值结果表明，受益于高双折射多芯光纤结构，当分析物折射率（RI）位于1.532至2.02 μm波长范围内时，平均灵敏度达到8083 nm/折射率单位（RIU）。在 (1.372, 1.432) 中。此外，如果分析物 RI 从 1.372 调整到 1.382，最大振幅灵敏度高达 226 RIU-1。考虑到其优异的传感性能，所提出的 SPR 多核 PCF 传感器可应用于环境、