设计了一种具有较大动态检测范围的新型光子晶体光纤折射率传感器。光子晶体光纤中一个空气孔镀上金纳米薄膜作为表面等离子体共振传感通道用来检测低于石英基底材料的液体折射率，一个空气孔填充待测液体作为定向耦合器通道用于检测高于石英基底材料的折射率。该传感器可以实现折射率为1.32~1.52范围内的检测，且具有较高的传感灵敏度。在各向异性的完美匹配层（PML）下利用全矢量有限元法（FEM）对该传感器特性进行了数值研究，结果表明：在1.32~1.44 和1.46~1.52 的折射率范围该折射率传感器灵敏度最高分别可达13500 nm/RIU 和28700 nm/RIU,RIU 为折射率单位。

A novel photonic crystal fiber refractive index sensor with a large dynamic detection range is proposed. Two air holes are used as analyte channels. One coated with gold layer is used as surface plasmon resonance to measure the liquid index below that of the quartz substrate and the other filled with the test liquid is used as the directional resonance coupling to measure the index that of above the quartz substrate. A broad index range of analyte from 1.33 to 1.52 with high sensitivity can be achieved. The properties of the index sensor are analyzed by finite element method (FEM) with the boundary condition of anisotropic perfectly matched layer (PML). The results show that the maximal sensitivities reach 13500 nm/RIU and 28700 nm/RIU when refractive index is in the range of 1.32 to 1.44 and 1.46 to 1.52 respectively, where RIU is refractive index unit.