基于亚波长悬浮芯光纤的高灵敏度气体传感器(英文)

High-Sensitivity Gas Sensor Based on Suspended Core Subwavelength Fiber

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。

A suspended-core fiber （SCF） with subwavelength core diameter is numerically analyzed for gas sensing application. The dependence of the relative sensitivity, parameters as well as the refractive index of fiber material effective mode area, and confinement loss on the fiber is investigated with finite element method. The simulation results show that the relative sensitivity and confinement loss will increase with the decrease of the core diameter and the fiber refractive index. The effective mode area decreases at first, and then increases when the fiber core decreases to a certain value. The confinement loss decreases dramatically with the increase of the air hole diameter, while the relative sensitivity and effective mode area remain unchanged. These results prove that the proposed SCF with subwavelength core diameter is very promising for developing a high-sensitivity gas sensor with large effective mode area and low confinement loss.