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数值分析了亚波长悬浮芯光纤在气体传感方面的应用。利用有限元法研究了相对灵敏度、有效模场面积、限制损耗与光纤参数包括纤芯直径和光纤材料折射率之间的关系。结果显示,相对灵敏度和限制损耗随着纤芯直径和光纤材料折射率的降低而增加。随着纤芯直径的减小,有效模场面积出现了先减小后增加的现象。增加包层孔直径能有效降低限制损耗,而相对灵敏度和有效模场面积保持不变。这些结果证明,亚波长悬浮芯光纤非常适合成为高灵敏度、大有效模场面积、低限制损耗的气体传感器。
The numerical analysis of the sub-wavelength suspension core fiber in gas sensing applications. The relative sensitivity, the effective mode field area, the limiting loss and the relationship between the fiber parameters including the core diameter and the refractive index of the optical fiber material are studied by means of the finite element method. The results show that relative sensitivity and limiting loss increase with decreasing core diameter and the refractive index of the optical fiber material. As the diameter of the core decreases, the effective mode field area first decreases and then increases. Increasing the cladding hole diameter can effectively reduce the limiting loss, while the relative sensitivity and effective mode field area remain unchanged. These results demonstrate that subwavelength suspended core fibers are well suited as gas sensors with high sensitivity, large effective mode field area and low limit loss.