设计出一种高灵敏度的新型椭圆侧芯光子晶体光纤传感器模型。圆形孔和3种不同大小椭圆孔构成该椭圆侧芯光子晶体光纤空气孔，其中椭圆孔的椭圆率分别为e、e₁、e₂，在椭圆率为e的左侧椭圆孔内涂敷金纳米薄膜。通过有限元分析软件COMSOL对传感器的传感特性进行数值分析。研究发现：表面等离子体共振的共振峰对待测液体折射率的变化有很高的传感灵敏度；光子晶体光纤传感器的灵敏度会随着椭圆率e、e₁以及金纳米薄膜的厚度而变化。折射率在1.40~1.42范围内，传感器灵敏度随着e₁的增大而增大；折射率在1.42~1.43范围内，传感器灵敏度随着e₁的增大先减小再增大。当椭圆率e₁=1.2、折射率为1.43时，灵敏度高达31800 nm/RIU（折射率单元）。折射率在1.38~1.43范围内，传感器灵敏度随着椭圆率e的增大而增大，当椭圆率e=2.3时，灵敏度高达33200 nm/RIU。折射率在1.42~1.43范围内，传感器灵敏度随着金纳米薄膜厚度的增大而减小，在折射率为1.43、金纳米薄膜厚度为40 nm时，传感器灵敏度高达34600 nm/RIU。

A new model of high-sensitivity elliptical side-core photonic crystal-fiber sensor is designed. A circular hole and three elliptical holes of different sizes constitute the elliptical side-core photonic crystal-fiber air hole, where the e, e₁, and e₂ are the ellipticities of the elliptical holes, and the gold-nano-film is coated in the left elliptical hole with the ellipticity e. The finite element analysis software, COMSOL, is used to numerically analyze the sensing characteristics of the sensor. We found that the resonant peak of surface plasmon resonance has a high sensitivity to the change in the refractive index of the measured liquid; the sensitivity of the photonic crystal-fiber sensor varies with ellipticities e, e₁ and the gold-nano-film thickness. Within the refractive index range of 1.40-1.42, the sensor sensitivity increases with increasing e₁; within the refractive index range of 1.42-1.43, the sensor sensitivity initially decreases and then increases with increasing e₁. When ellipticity e₁ is 1.2, and the refractive index is 1.43, the sensitivity reaches as high as 31800 nm/RIU (refractive index). At a refractive index of 1.38-1.43, the sensor sensitivity increases with increasing ellipticity e. When ellipticity e is 2.3, the sensitivity reaches as high as 33200 nm/RIU. When the refractive index is 1.42-1.43, the sensor sensitivity decreases with an increase in the gold-nano-film thickness. When the refractive index is 1.43, and the gold-nano-film thickness is 40 nm, the sensor sensitivity reaches as high as 34600 nm/RIU.