研究目的
Investigating the suitability of using gold-coated nanoporous anodic alumina structures as a platform for reflectometry-based plasmonic biosensors by numerical simulation.
研究成果
The study demonstrates that gold-coated nanoporous anodic alumina can be a platform for reflectometry-based plasmonic biosensors, with the ability to couple normally incident light to localized surface plasmon resonances. The sensitivity of the sensor depends on the gold coating thickness, with an optimal thickness that balances sensitivity and resonance sharpness.
研究不足
The study is based on numerical simulations, and actual experimental realization involves challenges such as the need for an extremely thin free-standing gold film. The sensitivity and Q-factor trade-off suggests the existence of an optimal gold coating thickness that is application-specific.
1：Experimental Design and Method Selection:
The study used 3D-FDTD (Finite-Difference Time-Domain) method for numerical simulation to obtain reflectance spectra of gold-coated nanoporous anodic alumina structures.
2：Sample Selection and Data Sources:
Two kinds of NAA structures were considered: short interpore distance corresponding to NAA obtained with oxalic acid electrolytes, and long interpore distance corresponding to NAA obtained with phosphoric acid electrolytes.
3：List of Experimental Equipment and Materials:
The simulations were performed using a commercial-grade FDTD-based simulator. The optical constants of the different material constituents are provided by the software material database.
4：Experimental Procedures and Operational Workflow:
The computational domain was defined with periodic boundary conditions in X and Y directions and Perfectly Matched Layers (PML's) in the Z direction. The optical source was defined as an incident plane wave perpendicular to the surface of the structure.
5：Data Analysis Methods:
The reflectance data as a function of wavelength was obtained by locating a monitor above the structure covering the whole computational domain.
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