Effective-medium properties of dense plasmonic balls

The electromagnetic behavior of dense plasmonic balls under plane wave illumination is investigated. High-precision T-matrix numerical calculations are used to compute the response of such balls for varying radii and volume fractions of gold nanoninclusions, up to 44%. The average scattered field is...

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Bibliographic Details
Published in2024 Eighteenth International Congress on Artificial Materials for Novel Wave Phenomena (Metamaterials) pp. 1 - 3
Main Authors Dwivedi, Ranjeet, Aradian, Ashod, Ponsinet, Virginie, Vynck, Kevin, Baron, Alexandre
Format Conference Proceeding
LanguageEnglish
Published IEEE 09.09.2024
Subjects
Dispersion
Gold
Magnetic materials
Metamaterials
Metasurfaces
Nonhomogeneous media
Permeability
Permittivity
Plasmons
Vectors
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Summary:The electromagnetic behavior of dense plasmonic balls under plane wave illumination is investigated. High-precision T-matrix numerical calculations are used to compute the response of such balls for varying radii and volume fractions of gold nanoninclusions, up to 44%. The average scattered field is accurately reproduced by that of a spatially dispersive homogeneous sphere characterized by three effective-medium parameters: an electric permittivity \varepsilon_{\text {eff }}, a magnetic permeability \mu_{\text {eff }} and a wave vector k_{\mathrm{L}}, associated to a longitudinal mode. Our results show that artificial magnetism can arise in the presence of strong interparticle couplings even when the inclusions exhibit no magnetic dipole. We also reveal the importance of the longitudinal mode to accurately reproduce the fields internal to the ball.
ISSN:2573-2706
DOI:10.1109/Metamaterials62190.2024.10703295