Liquid-core low-refractive-index-contrast Bragg fiber sensor
Liquid-core low-refractive-index-contrast Bragg fiber sensor
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DOI：
10.1063/1.3592758
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发表时间：
2011-03
期刊：
影响因子：
--
通讯作者：
H. Qu;M. Skorobogatiy
中科院分区：
文献类型：
--
作者：
H. Qu;M. Skorobogatiy
我们提出并实验证明了一种用于液体分析物折射率检测的低折射率对比度空芯布拉格光纤传感器。该传感器使用共振传感原理--当光纤芯中液体分析物的折射率改变时，光纤导模的共振限制也会改变，从而导致光纤传输中的光谱漂移和强度变化。作为演示，我们使用一组不同浓度的氯化钠溶液来表征布拉格光纤传感器。获得了很强的光谱漂移，传感器的实验灵敏度为~1400 nm/RIU(折射率单位)。此外，通过理论建模，我们发现低折射率对比度布拉格光纤比高折射率对比度布拉格光纤更适合液体分析物传感应用。
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.