A surface plasmon resonance (SPR) sensor based on D-shaped photonic crystal fiber (PCF) for a wider range of refractive index (RI) detection is proposed in this paper. Two nanoscale gold belts as plasmonic material for SPR are deposited on the D-shaped PCF plane.Asymmetric core enhances birefringence and makes the coupling of the y-polarized mode stronger. Numerical results indicate that wavelength sensitivities of 1700-12600 nm/RIU can be obtained in the sensing range of 1.15 to 1.36. The maximum sensor resolution reaches to 7.94$\times$10${}^{-6}$ RIU. The proposed sensor is suitable for the detection of low RI analytes, bio-sensing and chemical analysis.

提出了一种基于D形光子晶体光纤（PCF）的表面等离子体共振（SPR）传感器，用于更宽的折射率（RI）检测范围。在D形PCF平面上沉积了两个纳米级金带作为SPR的等离子体材料，不对称核增强了双折射并增强了y偏振模的耦合。数值结果表明，在1.15至1.36的感测范围内，可以获得1700-12600 nm / RIU的波长灵敏度。最大传感器分辨率达到7.94$\times$10${}^{-6}$RIU。拟议中的传感器适用于低RI分析物的检测，生物传感和化学分析。