Graphene-Based Ammonia-Gas Sensor Using In-Fiber Mach-Zehnder Interferometer

被引：54

作者：

Hao, Ting ^{[1
]}

Chiang, Kin Seng ^{[1
]}

机构：

[1] City Univ Hong Kong, Dept Elect Engn, Hong Kong, Hong Kong, Peoples R China

来源：

IEEE PHOTONICS TECHNOLOGY LETTERS | 2017年 / 29卷 / 23期

关键词：

Gas detection; long-period fiber grating; optical fiber sensor; two-dimensional material;

D O I：

10.1109/LPT.2017.2761981

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

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.

引用

页码：2035 / 2038

页数：4

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