Journal
OPTICS LETTERS
Volume 39, Issue 5, Pages 1235-1237Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.39.001235
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Funding
- National Natural Science Foundation of China [61290312, 61107072, 61107073]
- Program for Changjiang Scholars and Innovative Research Team in Universities of China (PCSIRT) [IRT1218]
- 111 Project [B14039]
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A graphene coated microfiber Bragg grating (GMFBG) for gas sensing is reported in this Letter. Taking advantage of the surface field enhancement and gas absorption of a GMFBG, we demonstrate an ultrasensitive approach to detect the concentration of chemical gas. The obtained sensitivities are 0.2 and 0.5 ppm for NH3 and xylene gas, respectively, which are tens of times higher than that of a GMFBG without graphene for tiny gas concentration change detection. Experimental results indicate that the GMFBG-based NH3 gas sensor has fast response due to its highly compact structure. Such a miniature fiber-optic element may find applications in high sensitivity gas sensing and trace analysis. (C) 2014 Optical Society of America
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