研究目的
To enhance the sensitivity of a surface plasmon resonance sensor by using 2D materials (MoS2 and graphene) in combination with noble (Au) and magnetic (Ni) materials in a Kretschmann configuration.
研究成果
The proposed SPR sensor configuration with MoS2 sandwiched between Au and Ni layers and graphene on top achieves a high sensitivity of 229°/RIU, which is superior to conventional and other reported sensors. This enhancement is due to the excellent absorption properties of MoS2 and graphene. The optimized structure (30 nm Au, 2 layers MoS2, 10 nm Ni, 1 layer graphene) shows promise for applications in chemical, medical, and biological sensing.
研究不足
The study is theoretical and based on numerical simulations; experimental validation is not provided. The optimization is limited to specific layer thicknesses and materials, and practical fabrication challenges (e.g., precise control of layer deposition) are not addressed. The sensor performance may be affected by real-world factors like noise and environmental conditions.
1：Experimental Design and Method Selection:
The study uses a theoretical analysis based on the Kretschmann configuration for SPR sensing. The transfer matrix method and Fresnel equations are employed to model the multilayer structure and calculate reflectivity and sensitivity.
2：Sample Selection and Data Sources:
The sensor configuration consists of layers: BK7 prism, Au film (30 nm), MoS2 layers (thickness depends on number of layers, with complex refractive index 5.0805 + 1.1723i at 633 nm), Ni film (10 nm), graphene layers (thickness depends on number of layers, with complex refractive index calculated as per equation), and a sensing medium with refractive index starting from 1.330. Optical parameters for Au and Ni are derived from Drude model formulas.
3：0805 + 1723i at 633 nm), Ni film (10 nm), graphene layers (thickness depends on number of layers, with complex refractive index calculated as per equation), and a sensing medium with refractive index starting from Optical parameters for Au and Ni are derived from Drude model formulas.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: A laser source with 633 nm wavelength is assumed for excitation. Materials include BK7 prism, Au, Ni, MoS2, graphene, and analyte.
4：Experimental Procedures and Operational Workflow:
Numerical simulations are performed using the transfer matrix method to compute reflectance curves, resonance angles, and sensitivity for various layer configurations. The number of MoS2 and graphene layers is varied to optimize sensitivity.
5：Data Analysis Methods:
Sensitivity is calculated as the change in resonance angle per unit change in refractive index of the sensing medium (δθres / δnc). Reflectance is derived from the reflection coefficient for p-polarized light.
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