研究目的
Investigating the characteristics of the Lorentz force exerted on a metal nanoscale particle by light irradiation and the effect of applying a smoothing algorithm to the surface of a nanoparticle on the accuracy of the simulation.
研究成果
The FDFD method with a subpixel smoothing technique accurately computes the Lorentz force acting on metal nanoparticles, showing enhancement at the plasmon resonance frequency. The smoothing technique significantly improves accuracy, especially when analyzing the attractive force between closely spaced spheres.
研究不足
The study is limited to spherical nanoparticles and does not explore the effects of non-spherical shapes or more complex aggregation states. The smoothing technique's effectiveness is demonstrated but may have limitations with very small cell sizes or highly irregular shapes.
1：Experimental Design and Method Selection:
The study used a finite difference method in the frequency domain (FDFD) to analyze the Lorentz force acting on metal nanoparticles. A smoothing algorithm was applied to the surface of nanoparticles to improve simulation accuracy.
2：Sample Selection and Data Sources:
The analysis focused on silver spheres of radius 15 nm in free space, with complex permittivity calculated from the Lorentz-Drude model.
3：List of Experimental Equipment and Materials:
The study utilized computational methods and did not specify physical equipment.
4：Experimental Procedures and Operational Workflow:
The FDFD method was implemented with a BiCGStab(l) iterative solver, using GPGPU technology. The spatial discrete intervals were each 1.5 nm, and the incident field was a plane wave polarized in the y-direction.
5：5 nm, and the incident field was a plane wave polarized in the y-direction.
Data Analysis Methods:
5. Data Analysis Methods: The Lorentz force was calculated from a volume integral of Maxwell’s stress tensors over the particle, with results compared to exact solutions from Mie theory.
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