基于两芯中空光纤的光流体光纤干涉仪,Optics Express

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基于两芯中空光纤的光流体光纤干涉仪
Optics Express ( IF 3.2 ) Pub Date : 2017-07-19 , DOI: 10.1364/oe.25.018205
Tingting Yuan , Xinghua Yang , Zhihai Liu , Jun Yang , Song Li , Depeng Kong , Xiuxiu Qi , Wenting Yu , Qunlong Long , Libo Yuan

我们演示了一种用于光纤光流检测的新型集成光纤干涉仪。它由专门设计的带有微通道和两个纤芯的空心光纤组成。微通道内表面上的一个纤芯用作传感臂，环形包层中的另一纤芯用作参考臂。在该设备中，采用融合和渐缩方法将光从单模光纤耦合到中空光纤。通过在中空光纤的表面上侧开一个微孔来实现采样。在中空纤维末端和微孔之间的压力差下，液体可以在微通道中形成稳定的微流。同时，干涉仪设备的干涉光谱随通道中微流体浓度的变化而变化。光纤流体干涉仪对NaCl的折射率敏感度约为2508 nm / RIU。对于药物浓度检测，其灵敏度为0.076 nm / mmolL^-1表示抗坏血酸。重要的是，这项工作提出了一种具有微通道的紧凑型微流体光纤干涉仪，该干涉仪可以与芯片装置集成在一起，而无需空间光耦合，也不需要复杂的芯片上的波导制造过程。

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Optofluidic in-fiber interferometer based on hollow optical fiber with two cores

We demonstrate a novel integrated optical fiber interferometer for in-fiber optofluidic detection. It is composed of a specially designed hollow optical fiber with a micro-channel and two cores. One core on the inner surface of the micro-channel is served as sensing arm and the other core in the annular cladding is served as reference arm. Fusion-and-tapering method is employed to couple light from a single mode fiber to the hollow optical fiber in this device. Sampling is realized by side opening a microhole on the surface of the hollow optical fiber. Under differential pressure between the end of the hollow fiber and the microhole, the liquids can form steady microflows in the micro-channel. Simultaneously, the interference spectrum of the interferometer device shifts with the variation of the concentration of the microfluid in the channel. The optofluidic in-fiber interferometer has a sensitivity of refractive index around 2508 nm/RIU for NaCl. For medicine concentration detection, its sensitivity is 0.076 nm/mmolL⁻¹ for ascorbic acid. Significantly, this work presents a compact microfluidic in-fiber interferometer with a micro-channel which can be integrated with chip devices without spatial optical coupling and without complex manufacturing procedure of the waveguide on the chips.

更新日期：2017-07-21

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