title: Graphene-coated tilted fiber-Bragg grating for enhanced sensing in low-refractive-index region.
abstract: We propose and experimentally demonstrate a method to significantly extend the sensitive window of tilted fiber-Bragg grating (TFBG) into low-refractive-index region with the integration of graphene coating. The coupling between cladding modes of TFBG and graphene coating results in an obvious modification of the cladding-mode envelope, which provides a sensitive regime relying on graphene's complex refractive index. Interacting the graphene-coated TFBG with various aqueous solutions, we observe strongly enhanced sensitivity in the low-refractive-index region of 1-1.428, which is about 10-fold extended from that of the unloaded TFBG. The graphene-coated TFBGs present great potentials in the biochemical sensing window.
authors.forename: Biqiang
authors.initials: B
authors.lastname: Jiang
authors.forename: Xin
authors.initials: X
authors.lastname: Lu
authors.forename: Xuetao
authors.initials: X
authors.lastname: Gan
authors.forename: Mei
authors.initials: M
authors.lastname: Qi
authors.forename: Yadong
authors.initials: Y
authors.lastname: Wang
authors.forename: Lei
authors.initials: L
authors.lastname: Han
authors.forename: Dong
authors.initials: D
authors.lastname: Mao
authors.forename: Wending
authors.initials: W
authors.lastname: Zhang
authors.forename: Zhaoyu
authors.initials: Z
authors.lastname: Ren
authors.forename: Jianlin
authors.initials: J
authors.lastname: Zhao
mesh_terms: D006108:Graphite / Q000737:chemistry*; D055100:Optical Fibers; D012031:Refractometry
chemical_list: D006108:Graphite