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Long-wavelength electromagnetic propagation in magnetoplasmonic core-shell nanostructures
M Essone Mezeme1, S Lasquellec, C Brosseau
1Lab-STICC, Université Européenne de Bretagne-Université de Brest, CS 93837, 6 Avenue Le Gorgeu, 29238 Brest Cedex 3, France.
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|September 28, 2010
Summary
The product rule for magnetoplasmonic core-shell nanostructures is often invalid near resonance. Simulations show corrections can exceed mean-field values by over 750%, highlighting significant field enhancements.
Area of Science:
- Physics
- Materials Science
- Nanotechnology
Background:
- Magnetoplasmonic core-shell (CS) nanostructures offer unique electromagnetic properties.
- The product rule is a common approximation for calculating effective material properties.
Purpose of the Study:
- To evaluate the accuracy of the product rule for CS nanostructures.
- To quantify deviations from the product rule near plasmon resonance.
Main Methods:
- Numerical simulations were employed to compute effective permittivity and magnetic permeability.
- Analysis focused on the behavior of CS nanostructures close to resonance.
Main Results:
- The product rule shows significant departures from simulation results near resonance.
- Corrections to the mean-field approximation can exceed the mean-field value by over 750% at plasmon resonance.
- Spatially nonuniform electric and magnetic field enhancements were observed at the nanometer scale.
Conclusions:
- The quasistatic mean-field product rule is not universally valid for CS nanostructures, especially near resonance.
- Significant deviations necessitate advanced models for accurate property prediction.
- Understanding field enhancements is crucial for designing plasmonic devices.
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