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 microporous optical fiber with six large air holes around the core was designed for surface plasmon resonance (SPR) sensors. The effect of metal film thickness, interpore spacing, pore size and refractive index of external environment on the wavelength of surface plasmon resonance and the sensitivity of the sensor were studied by using the finite element method. The results show that the thickness of the metal film and the refractive index of the external environment are relatively sensitive to the position of the formant. However, the diameter of the air hole and the spacing of the holes remain substantially unchanged at a small range. The sensitivity of the sensor can also reach 10-4. In order to reduce the overall loss of the sensor, the metal film can be selectively deposited on the air hole, and its sensitivity is not greatly affected.