研究目的
To study the influence of the Coulomb potential and the electrostatic potential (CPEP) on the eigen-frequencies of the coupled plasmons using a coupled oscillator model and to present a novel physical model for this influence.
研究成果
The CPEP model, combined with the coupled harmonic oscillator model, can explain well the coupled process of the plasmons. It successfully explains the asymmetrical evolution mechanism of the peaks values of absorption spectra with the coupling distance between the nano-elements and obtains the resonant frequency difference between oscillator 1 and oscillator 2.
研究不足
The CPEP model cannot predict accurately and quantitatively the experimental properties measured such as the resonance frequencies, the line-widths, and the phase factor, but it reveals their interactions and guides us to understand the underlying physical significance.
1：Experimental Design and Method Selection:
A coupled oscillator model is employed to describe the eigen-frequencies of the coupled plasmons. The finite element method is used for numerical simulation of the absorption spectra of a microstructure unit composed of a metal nanostructure.
2：Sample Selection and Data Sources:
The microstructure unit is composed of a silver nano-square hollow frame (SNSHF) and a silver nano-rod (SNR) on a glass substrate.
3：List of Experimental Equipment and Materials:
Glass substrate with a dissipation factor of 0.0001 and the index of refraction of 1.45, silver nano-square hollow frame, and silver nano-rod.
4：0001 and the index of refraction of 45, silver nano-square hollow frame, and silver nano-rod.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The absorption characteristics, electric field, and charge distribution of the microstructure unit were simulated numerically using the finite element method. Perfectly matched layers are implemented in the numerical simulation.
5：Data Analysis Methods:
The absorption spectra are obtained by calculating the heat loss. The results are analyzed using the CPEP model and the harmonic oscillator model.
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