研究目的
Investigating the tuning property and sensitivity enhancement of the long period fiber grating (LPFG) coated with a higher refractive index film by integrating a monolayer graphene.
研究成果
The graphene integrated LPFG devices show unique tunable properties at a wide range, making them promising for applications in sensing and telecommunication. An ultrahigh sensitivity up to 28 337.5 nm/RIU is achieved, which is 2.57 times higher than that of the conventional LPFG without graphene.
研究不足
The study is theoretical, and actual sensor performance might show some differences with theoretical optimization. The film deposition and graphene synthesis techniques are key factors for actual sensor fabrication.
1：Experimental Design and Method Selection:
The study theoretically demonstrates the tuning property and sensitivity enhancement of LPFG coated with a higher refractive index film by integrating a monolayer graphene. The variation rule of the mode characteristics and the resonance with the chemical potential of the graphene are explored.
2：Sample Selection and Data Sources:
A commercial Corning? SMF-28e+ single mode fiber is used. The LPFG has a modulation amplitude of δn = 3.0 × 10?4 in the fiber core, a grating period of 197.2 μm, and a grating length of 27 mm.
3：0 × 10?4 in the fiber core, a grating period of 2 μm, and a grating length of 27 mm.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: The theoretical model consists of five layers, including fiber core, fiber cladding, HRI film, graphene layer, and external analyte environment.
4：Experimental Procedures and Operational Workflow:
The resonance condition is described by the phase-matching-condition (PMC). The transmission of the graphene integrated LPFG with HRI film is solved using the Runge-Kutta integration.
5：Data Analysis Methods:
The variation of the conductivity and refractive index with chemical potential is analyzed. The sensitivity is calculated based on the resonance wavelength shift.
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