title: Graphene-coated microfiber Bragg grating for high-sensitivity gas sensing.
abstract: 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.
authors.forename: Yu
authors.initials: Y
authors.lastname: Wu
authors.forename: Baicheng
authors.initials: B
authors.lastname: Yao
authors.forename: Anqi
authors.initials: A
authors.lastname: Zhang
authors.forename: Yunjiang
authors.initials: Y
authors.lastname: Rao
authors.forename: Zegao
authors.initials: Z
authors.lastname: Wang
authors.forename: Yang
authors.initials: Y
authors.lastname: Cheng
authors.forename: Yuan
authors.initials: Y
authors.lastname: Gong
authors.forename: Weili
authors.initials: W
authors.lastname: Zhang
authors.forename: Yuanfu
authors.initials: Y
authors.lastname: Chen
authors.forename: K S
authors.initials: KS
authors.lastname: Chiang