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%−1 for 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.
Highlights
The fiber optic surface plasmon resonance (SPR) sensor [1,2,3] has been widely used in biochemistry, medical analysis and environmental monitoring, owing to its fast response, being label-free, and its real-time detection
The fiber grating–assisted SPR sensors are designed by integrating metal overlays on the fiber gratings, which exhibits advantages over the modified fiber-based SPR
We further explore the response characteristics of the the graphene-based graphene-based long-period fiber grating (LPFG)
Summary
The fiber optic surface plasmon resonance (SPR) sensor [1,2,3] has been widely used in biochemistry, medical analysis and environmental monitoring, owing to its fast response, being label-free, and its real-time detection. In order to improve the sensitivity of the sensor, various fiber SPR structures have been designed to effectively couple the fiber core mode into the SPR mode on the fiber surface. The circular symmetry of the fibers is inevitably broken, resulting in polarization dependence [9]. The asymmetric destruction of the modified fibers weakens the mechanical stability of the fiber optic SPR sensors. To overcome these drawbacks, the fiber grating–assisted SPR sensors are designed by integrating metal overlays on the fiber gratings, which exhibits advantages over the modified fiber-based SPR sensors, such as preservation of the structural integrity and circular symmetry of the fiber [9]
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
