Fibre optic chemical sensor based on graphene oxide-coated long period grating

Chen Liu; Qi Cai; Zhongyuan Sun; Baojian Xu; Jianlong Zhao; Lin Zhang; Xianfeng Chen

doi:10.1117/12.2235671

30 May 2016 Fibre optic chemical sensor based on graphene oxide-coated long period grating

Chen Liu, Qi Cai, Zhongyuan Sun, Baojian Xu, Jianlong Zhao, Lin Zhang, Xianfeng Chen

Author Affiliations +

Proceedings Volume 9916, Sixth European Workshop on Optical Fibre Sensors; 99160V (2016) https://doi.org/10.1117/12.2235671
Event: Sixth European Workshop on Optical Fibre Sensors (EWOFS'2016), 2016, Limerick, Ireland

Abstract

In this work, a graphene oxide-coated long period fibre grating (GO-LPG) is proposed for chemical sensing application. Graphene oxide (GO) has been deposited on the surface of long period grating to form a sensing layer which significantly enhances the interaction between LPG propagating light and the surrounding-medium. The sensing mechanism of GO-LPG relies on the change of grating resonance intensity against surrounding-medium refractive index (SRI). The proposed GO-LPG has been used to measure the concentrations of sugar aqueous solutions. The refractive index sensitivities with 99.5 dB/RIU in low refractive index region (1.33-1.35) and 320.6 dB/RIU in high index region (1.42-1.44) have been achieved, showing an enhancement by a factor of 3.2 and 6.8 for low and high index regions, respectively. The proposed GO-LPG can be further extended to the development of optical biochemical sensor with advantages of high sensitivity, real-time and label-free sensing.

Citation Download Citation

Chen Liu, Qi Cai, Zhongyuan Sun, Baojian Xu, Jianlong Zhao, Lin Zhang, and Xianfeng Chen "Fibre optic chemical sensor based on graphene oxide-coated long period grating", Proc. SPIE 9916, Sixth European Workshop on Optical Fibre Sensors, 99160V (30 May 2016); https://doi.org/10.1117/12.2235671

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