研究目的
Investigating the influence of the dielectric substrate on the full-space far-field scattering behavior of surface plasmon resonance mode in plasmonic nanostructures.
研究成果
The existence of a dielectric substrate with a large refractive index effectively suppresses the backscattered energy of the radiation and concentrates the scattering energy to the front scattering space domain. The study provides a novel understanding of the dielectric substrate modulated full-space far-field scattering behavior of plasmon structures and a new strategy for directional control of incident light energy.
研究不足
The study focuses on lossless dielectric substrates, and the physical mechanism described may not fully explain the far-field influence of lossy substrates due to their complex optical dispersion relationship.
1：Experimental Design and Method Selection:
A simple metal-nanorod/dielectric-substrate structure system was designed to investigate the substrate's influence on plasmon far-field scattering behavior. Numerical calculations were performed using a total-field scattered-field (TFSF) source with a spectral range from 500 nm to 900 nm.
2：Sample Selection and Data Sources:
Gold (Au) nanorods with specific dimensions (Lx=120 nm, Ly=40 nm) located on a lossless dielectric substrate were used. The refractive index data of Au from Johnson and Christy were utilized.
3：List of Experimental Equipment and Materials:
The simulation platform's far-field module was used to obtain far-field patterns.
4：Experimental Procedures and Operational Workflow:
The far-field pattern was obtained by integrating the scattered power flux over an enclosed surface outside the TFSF source.
5：Data Analysis Methods:
The total scattering cross sections were calculated by integrating the scattered power flux over an enclosed surface outside the TFSF source.
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