Graphene-Based Ammonia-Gas Sensor Using In-Fiber Mach-Zehnder Interferometer
Graphene-Based Ammonia-Gas Sensor Using In-Fiber Mach-Zehnder Interferometer
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DOI：
10.1109/lpt.2017.2761981
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发表时间：
2017-12-01
影响因子：
2.6
通讯作者：
Chiang, Kin Seng
中科院分区：
文献类型：
--
作者：
Hao, Ting;Chiang, Kin Seng
提出并演示了一种由一对 3 dB 长周期光纤光栅组成的坚固的石墨烯涂层光纤内马赫-曾德干涉仪 (MZI)，用于氨 (NH3) 气体传感。该传感器的工作原理是通过吸附NH3分子改变石墨烯涂层的电导率来改变光纤包层模式的相位，从而引起干涉光谱的偏移，偏移量取决于气体浓度。我们的实验传感器显示，对于 10 至 180 ppm 的气体浓度，其灵敏度约为 3 pm/ppm。所提出的光纤内 MZI 可以作为开发包含二维材料的光纤传感器和设备的通用平台。
A robust graphene-coated in-fiber Mach-Zehnder interferometer (MZI) formed with a pair of 3-dB long-period fiber gratings is proposed and demonstrated for ammonia (NH3) gas sensing. The sensor operates on the principle of changing the phase of the cladding mode of a fiber through changing the conductivity of the graphene coating by adsorbed NH3 molecules, which gives rise to a shift in the interference spectrum with an amount that depends on the gas concentration. Our experimental sensor shows a sensitivity of similar to 3 pm/ppm for a gas concentration from similar to 10 to similar to 180 ppm. The proposed in-fiber MZI can serve as a generic platform for the development of fiber sensors and devices that incorporate two-dimensional materials.