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Measurement of Scattering Nonlinearities from a Single Plasmonic Nanoparticle
Published on: January 3, 2016
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Real-time dynamics of plasmonic resonances in nanoparticles described by a boundary element method with generic
Giulia Dall'Osto1, Gabriel Gil1, Silvio Pipolo2
1Department of Chemical Sciences, University of Padova, via Marzolo 1, Padova, Italy.
The Journal of Chemical Physics
|November 14, 2020
Summary
This study introduces an advanced time-domain boundary element method (TD-BEM) for simulating nanoplasmonics. The new method accurately models complex metal dielectric functions, offering deeper insights into nanoparticle behavior under light pulses.
Area of Science:
- Computational physics
- Nanophotonics
- Materials science
Background:
- Investigating nanoplasmonics with time-dependent methods reveals phenomena hidden in frequency-based analyses.
- Existing time-domain boundary element methods (TD-BEM) use simplified metal dielectric functions, limiting accuracy for complex resonances.
Purpose of the Study:
- To enhance the TD-BEM by incorporating complex frequency-dependent dielectric functions for metals.
- To accurately simulate time-dependent nanoplasmonics, especially for challenging materials like gold.
Main Methods:
- Developed an advanced TD-BEM framework capable of describing metals with intricate dielectric function profiles.
- Applied the method to various metals (gold, silver, rhodium) and nanoparticle shapes (spheres, ellipsoids, cubes).
Main Results:
- Successfully integrated complex dielectric functions into TD-BEM simulations.
- Validated the approach by comparing TD-BEM and frequency-domain BEM absorption spectra.
- Investigated time-dependent electromagnetic fields near nanoparticle vertices.
Conclusions:
- The enhanced TD-BEM provides a more accurate and versatile tool for simulating time-dependent nanoplasmonics.
- This method is crucial for understanding light-matter interactions at the nanoscale, particularly with complex metallic systems.
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