Coupled dipole approximation across the Γ-point in a finite-sized nanoparticle array

We study the response of a finite-sized nanoparticle array to an incident field in the vicinity of the Γ-point of the lattice. Using the coupled dipole approximation, we find that the dipole distributions can be strongly inhomogeneous and that strong modulations appear as the energy is above the Γ-p...

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Bibliographic Details
Published in:Philosophical transactions of the Royal Society of London. Series A: Mathematical, physical, and engineering sciences physical, and engineering sciences, 2017-03, Vol.375 (2090), p.1-12
Main Authors: Martikainen, J.-P., Moilanen, A. J., Törmä, P.
Format: Article
Language:English
Online Access:Get full text
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Summary:We study the response of a finite-sized nanoparticle array to an incident field in the vicinity of the Γ-point of the lattice. Using the coupled dipole approximation, we find that the dipole distributions can be strongly inhomogeneous and that strong modulations appear as the energy is above the Γ-point. We highlight how this is reflected in real-space extinction efficiencies as well as in radiation patterns from the finite-sized array. This article is part of the themed issue 'New horizons for nanophotonics'.
ISSN:1364-503X