title: Graphene-Based Long-Period Fiber Grating Surface Plasmon Resonance Sensor for High-Sensitivity Gas Sensing.
abstract: A graphene-based long-period fiber grating (LPFG) surface plasmon resonance (SPR) sensor is proposed. A monolayer of graphene is coated onto the Ag film surface of the LPFG SPR sensor, which increases the intensity of the evanescent field on the surface of the fiber and thereby enhances the interaction between the SPR wave and molecules. Such features significantly improve the sensitivity of the sensor. The experimental results demonstrate that the sensitivity of the graphene-based LPFG SPR sensor can reach 0.344 nm%-1for methane, which is improved 2.96 and 1.31 times with respect to the traditional LPFG sensor and Ag-coated LPFG SPR sensor, respectively. Meanwhile, the graphene-based LPFG SPR sensor exhibits excellent response characteristics and repeatability. Such a SPR sensing scheme offers a promising platform to achieve high sensitivity for gas-sensing applications.
authors.affiliation: Key Laboratory of Optoelectronic Technology & Systems, Ministry of Education of China, College of Optoelectronic Engineering, Chongqing University, Chongqing 400044, China. wwei@cqu.edu.cn.|Chongqing Research Center for Advanced Materials, Chongqing Academy of Science and Technology, Chongqing 401123, China. wwei@cqu.edu.cn.|Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 401122, China. wwei@cqu.edu.cn.
authors.forename: Wei
authors.initials: W
authors.lastname: Wei
authors.affiliation: Key Laboratory of Optoelectronic Technology & Systems, Ministry of Education of China, College of Optoelectronic Engineering, Chongqing University, Chongqing 400044, China. nongjp@cigit.ac.cn.|Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 401122, China. nongjp@cigit.ac.cn.
authors.forename: Jinpeng
authors.initials: J
authors.lastname: Nong
authors.affiliation: Key Laboratory of Optoelectronic Technology & Systems, Ministry of Education of China, College of Optoelectronic Engineering, Chongqing University, Chongqing 400044, China. 20093440@cqu.edu.cn.
authors.forename: Guiwen
authors.initials: G
authors.lastname: Zhang
authors.affiliation: Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 401122, China. tll@cigit.ac.cn.|Chongqing Engineering Research Center of Graphene Film Manufacturing, Chongqing 401329, China. tll@cigit.ac.cn.
authors.forename: Linlong
authors.initials: L
authors.lastname: Tang
authors.affiliation: Key Laboratory of Optoelectronic Technology & Systems, Ministry of Education of China, College of Optoelectronic Engineering, Chongqing University, Chongqing 400044, China. 20103279@cqu.edu.cn.
authors.forename: Xiao
authors.initials: X
authors.lastname: Jiang
authors.affiliation: Key Laboratory of Optoelectronic Technology & Systems, Ministry of Education of China, College of Optoelectronic Engineering, Chongqing University, Chongqing 400044, China. 20150802007@cqu.edu.cn.
authors.forename: Na
authors.initials: N
authors.lastname: Chen
authors.affiliation: Chongqing Research Center for Advanced Materials, Chongqing Academy of Science and Technology, Chongqing 401123, China. ssuqinluo@163.com.
authors.forename: Suqin
authors.initials: S
authors.lastname: Luo
authors.affiliation: Key Laboratory of Optoelectronic Technology & Systems, Ministry of Education of China, College of Optoelectronic Engineering, Chongqing University, Chongqing 400044, China. 20133092@cqu.edu.cn.
authors.forename: Guilian
authors.initials: G
authors.lastname: Lan
authors.affiliation: Key Laboratory of Optoelectronic Technology & Systems, Ministry of Education of China, College of Optoelectronic Engineering, Chongqing University, Chongqing 400044, China. yongzhu@cqu.edu.cn.
authors.forename: Yong
authors.initials: Y
authors.lastname: Zhu
keywords: graphene; long-period fiber grating; sensitivity; surface plasmon resonance