Graphene-coated tilted fiber-Bragg grating for enhanced sensing in low-refractive-index region

• DOI: 10.1364/ol.40.003994
• Publication Date: 2015-08-18T20:48:56Z
• Authors: Biqiang Jiang; Xin Lu; Xuetao Gan; Mei Qi; Yadong Wang; Lei Han; Dong Mao; Wending Zhang; Zhaoyu Ren; Jianlin Zhao
• Keywords: Cladding (metalworking); Fiber Bragg Grating; Cladding mode

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 integration graphene coating. The coupling between cladding modes TFBG coating results in an obvious modification cladding-mode envelope, which provides regime relying on graphene's complex refractive index. Interacting graphene-coated various aqueous solutions, we observe strongly enhanced sensitivity 1-1.428, is about 10-fold extended from that unloaded TFBG. TFBGs present great potentials biochemical sensing window.