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Measurement of Scattering Nonlinearities from a Single Plasmonic Nanoparticle

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Evaluating the Accuracy of the COMSOL-Based Finite-Element Method for Simulating Plasmon-Modified Fluorescence.

Fernando A Del Castillo¹, Nyssa T Emerson¹, Haw Yang¹

¹Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States.

The Journal of Physical Chemistry. B

|October 23, 2024

Summary

This summary is machine-generated.

Accurate modeling of plasmon-enhanced fluorescence is crucial for nanostructure design. This study validates COMSOL Multiphysics simulations against analytical theory, finding specific meshing parameters are key for reliable fluorescence enhancement predictions.

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Area of Science:

Nanophotonics
Computational Electromagnetics

Background:

Plasmon-modified fluorescence is vital for designing nanostructures that enhance light emission.
Accurate simulations are needed to guide experimental efforts in creating reproducible fluorescence "hot spots".

Purpose of the Study:

To investigate the accuracy of COMSOL Multiphysics for modeling plasmon-modified fluorescence.
To compare simulation results with an exact analytical theory for a gold nanosphere system.

Main Methods:

Utilized an analytically tractable model of a gold nanosphere interacting with a point dipole or plane wave.
Compared COMSOL Multiphysics simulation outcomes with formal analytical theory.
Investigated the impact of simulation parameters, particularly adaptive meshing, on accuracy.

Main Results:

Standard plane-wave scattering parameters in COMSOL do not guarantee accuracy for dipole emission cases.
User-defined adaptive meshing parameters significantly improve quantitative agreement between COMSOL and analytical results.
Achieving convergence requires at least two mesh elements between the dipole source and the nanoparticle surface.

Conclusions:

COMSOL Multiphysics can accurately model plasmon-modified fluorescence with appropriate meshing.
Practical guidelines for COMSOL meshing are provided to enhance simulation reliability for fluorescence modification experiments.