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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 large dynamic detection range was designed. An air hole in the photonic crystal fiber is coated with a gold nanometer thin film as a surface plasmon resonance sensing channel for detecting liquid refractive index lower than that of the quartz base material. An air hole fills the liquid to be measured as a directional coupler channel for detecting higher than Refractive index of quartz substrate material. The sensor can achieve the refractive index of 1.32 ~ 1.52 range of detection, and has a high sensitivity. The full-scale finite element method (FEM) was used to study the characteristics of the sensor under the anisotropic perfect matching layer (PML). The results show that the sensitivity of the sensor in the refractive index range of 1.32 ~ 1.44 and 1.46 ~ 1.52 Up to 13500 nm / RIU and 28700 nm / RIU respectively, with RIU as the index of refraction.