摘要
The excitation of the surface field and evanescent enhancement in the graphene have shown sensitive to the refractive index of surrounding media and potential applications in high-sensitivity biochemical sensing. In this paper, we investigate the graphene-coated microfiber Bragg gratings （GMFBGs） with different diameters for ammonia gas sensing. The maximum sensitivity with 6pm/ppm was achieved experimentally when the microfiber＇s diameter was about 10 μm. Moreover, by adjusting the diameter of the GMFBG, the sensing performance of the GMFBGs could be optimized. Experimental results indicated that GMFBGs with the diameter of 8μm - 12μm would show the characteristics of the high sensitivity, relative low attenuation, and large dynamic range.
The excitation of the surface field and evanescent enhancement in the graphene have shown sensitive to the refractive index of surrounding media and potential applications in high-sensitivity biochemical sensing. In this paper, we investigate the graphene-coated microfiber Bragg gratings （GMFBGs） with different diameters for ammonia gas sensing. The maximum sensitivity with 6pm/ppm was achieved experimentally when the microfiber＇s diameter was about 10 μm. Moreover, by adjusting the diameter of the GMFBG, the sensing performance of the GMFBGs could be optimized. Experimental results indicated that GMFBGs with the diameter of 8μm - 12μm would show the characteristics of the high sensitivity, relative low attenuation, and large dynamic range.
基金
The authors greatly thank Dr. Zegao Wang and Prof. Yuanfu Chen of the State Key Lab of Electronic Thin Films and Integrated Devices, University of Electronic Science ＆ Technology of China, for their help on the preparation and test of the graphene used in the study and useful discussions. This work was supported by the National Natural Science Foundation of China under Grant 61290312, 61107072, and 61107073. It was also supported by Program for Changjiang Scholars and Innovative Research Team in Universities of China （PCSIRT） and the ＂111 Project＂ of China Education Ministry.
