Refractive index sensor using microfiber-based Mach-Zehnder interferometer
Refractive index sensor using microfiber-based Mach-Zehnder interferometer
复制标题
使用基于微纤维的马赫曾德尔干涉仪的折射率传感器
DOI：
10.1364/ol.37.000067
复制
发表时间：
2012-01-01
期刊：
影响因子：
3.6
通讯作者：
Liu, Deming
中科院分区：
文献类型：
--
作者：
Wo, Jianghai;Wang, Guanghui;Liu, Deming
介绍了一种基于马赫-曾德尔干涉仪的简单、鲁棒的折射率传感器。采用一段石英光纤拉制的微光纤作为传感臂，由于倏逝场的存在，环境折射率的微小变化将导致微光纤传播常数的变化，进而改变微光纤的光程。为了补偿光程差的变化，在另一个臂上插入可调谐光延迟线（ODL），通过测量ODL的延迟，可以简单地解调环境RI。当微纤直径为2.0 μ m时，可获得约7159 μ m/折射率单位的高折射率灵敏度。(C)2011年美国光学学会
A simple and robust refractive index (RI) sensor based on a Mach-Zehnder interferometer has been demonstrated. A section of optical microfiber drawn from silica fiber is employed as the sensing arm. Because of the evanescent field, a slight change of the ambient RI will lead to the variation of the microfiber propagation constant, which will further change the optical length. In order to compensate the variation of the optical length difference, a tunable optical delay line (ODL) is inserted into the other arm. By measuring the delay of the ODL, the ambient RI can be simply demodulated. A high RI sensitivity of about 7159 mu m/refractive index unit is achieved at microfiber diameter of 2.0 mu m. (C) 2011 Optical Society of America