设计了纤芯周围具有6个大空气孔的微孔光纤用于表面等离子体共振(SPR)传感器。利用有限元方法研究金属膜厚、微孔间距、微孔尺寸及外界环境折射率对表面等离子体共振峰所处波长的影响及传感器的灵敏度。结果显示，金属膜厚及外界环境折射率对共振峰的位置都比较敏感，而空气孔的直径和孔间距在小范围变化时谐振峰的位置基本保持不变。该传感器的灵敏度也可以达到10-4。为了降低传感器的整体损耗，可以进行选择性的对空气孔沉积金属膜，而其灵敏度并不受很大的影响。

A microstructured-fiber containing six large air holes is proposed to achieve surface plasmon resonance (SPR) sensor. The finite element method is used to analyze characteristics of the SPR sensor. The effects of the thickness of metal films, pitch between air holes, diameter of air holes and refractive index of liquid on the resonance wavelength are elucidated. The sensitivity of sensor is also given. The result shows that the resonance wavelength is sensitive to the thickness of metal film and refractive index of environment, while the resonance wavelength does not change basically when the pitch between air holes and diameter of air holes varies. The proposed SPR sensor exhibits high sensitivity up to 10-4.