研究目的
To propose and analyze a self-referencing plasmonic platform that supports multiple modes including localized surface plasmon resonance (LSPR), surface plasmon resonance (SPR), and Fabry-Perot resonances for sensing applications.
研究成果
The proposed structure supports multiple coupled modes including LSPR, SPR, and Fabry-Perot resonances, enabling a self-referenced plasmonic sensor. The LSPR dominant mode is sensitive to changes in the surrounding medium, while the SPR dominant mode remains insensitive, suitable for self-referencing. The structure is easy to fabricate and shows promise for practical applications in sensing.
研究不足
The sensitivity of the sensor to surface attachments is lower for cylindrical geometry compared to cubic geometry. The design requires careful optimization to achieve a self-referencing peak which is optically isolated from the analyte.
1：Experimental Design and Method Selection:
The structure was simulated using rigorous coupled wave analysis method using commercial software. Dielectric properties of gold were extracted from experimental data. The structure was simulated in three dimensions with periodic boundary conditions in the transverse plane.
2：Sample Selection and Data Sources:
The structure was optimized to sense for changes in the refractive index when the surrounding medium is water.
3：List of Experimental Equipment and Materials:
Gold nano-grating, dielectric spacer layer, gold thin film, glass substrate.
4：Experimental Procedures and Operational Workflow:
The structure was simulated with incident light assumed to be a plane wave incident on the structure normally. Convergence studies were done on the number of harmonics used in the simulation.
5：Data Analysis Methods:
The reflection and absorption spectra were analyzed to understand the resonance features and their sensitivity to the surrounding medium.
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