研究目的
Investigating the influence of different oxide overlayers on the performance of a phase modulated optical fiber sensor coated with graphene to improve its phase sensitivity.
研究成果
The phase-modulated optical fiber sensor based on graphene-oxide demonstrates high sensitivity, with the maximum sensitivity achieved using a 35 nm TeO2 coating on monolayer graphene (1.3467×105deg/RIU). The proposed sensors have great potential in biological and chemical applications.
研究不足
The study is limited to specific oxides (MgO, Al2O3, Lu2O3, Sc2O3, TeO2) and a specific wavelength (632.8 nm). The refractive index range of the sensing medium is set to 1.38-1.39, which may not cover all potential applications.
1：Experimental Design and Method Selection:
The simulation model is constructed according to the transmission matrix theory. Different oxides coatings (MgO, Al2O3, Lu2O3, Sc2O3, TeO2) are added on the surface of monolayer graphene to improve the phase sensitivity of the sensor.
2：Sample Selection and Data Sources:
The sensor is based on a D-type optical fiber with a residual core height of 4um and a sensing area length of 5 mm. Laser with 632.8 nm wavelength is used as the light source.
3：8 nm wavelength is used as the light source.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Single mode optical fibers with a numerical aperture of 0.11, and oxides with varying refractive indices at 632.8 nm.
4：11, and oxides with varying refractive indices at 8 nm.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The phase sensitivity is optimized by changing the type and thickness of the oxide coating, with thickness ranging from 0 to 100 nm.
5：Data Analysis Methods:
The total phase difference and sensitivity under different oxide types and thicknesses are calculated and analyzed.
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