标题： 液芯低折射率对比布拉格光纤传感器 显示英文标题

标题： Liquid-core low-refractive-index-contrast Bragg fiber sensor

摘要： 我们提出并实验演示了一种低折射率对比度的空心核心布拉格光纤传感器，用于液体分析物折射率检测。 该传感器使用谐振传感原理——当光纤核心中液体分析物的折射率发生变化时，光纤导模的谐振限制也会发生变化，导致光纤传输中的光谱位移和强度变化。 作为演示，我们使用一组不同浓度的氯化钠溶液对布拉格光纤传感器进行表征。 实验测得传感器的灵敏度约为1400nm/RIU（折射率单位），获得了显著的光谱位移。 此外，通过理论建模，我们表明低折射率对比度的布拉格光纤比高折射率对比度的同类光纤更适合用于液体分析物传感应用。 显示英文摘要

摘要： We propose and experimentally demonstrate a low-refractive-index-contrast hollow-core Bragg fiber sensor for liquid analyte refractive index detection. The sensor operates using a resonant sensing principle- when the refractive index of a liquid analyte in the fiber core changes, the resonant confinement of the fiber guided mode will also change, leading to both the spectral shifts and intensity changes in fiber transmission. As a demonstration, we characterize the Bragg fiber sensor using a set of NaCl solutions with different concentrations. Strong spectral shifts are obtained with the sensor experimental sensitivity found to be ~1400nm/RIU (refractive index unit). Besides, using theoretical modeling we show that low-refractive-index-contrast Bragg fibers are more suitable for liquid-analyte sensing applications than their high-refractive-index-contrast counterparts.