title: Coupled dipole approximation across the Γ-point in a finite-sized nanoparticle array.
abstract: 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'.
authors.affiliation: COMP Centre of Excellence, Department of Applied Physics, Aalto University, PO Box 15100, 00076 Aalto, Finland.
authors.forename: J-P
authors.identifier: http://orcid.org/0000-0001-8624-6383
authors.initials: JP
authors.lastname: Martikainen
authors.affiliation: COMP Centre of Excellence, Department of Applied Physics, Aalto University, PO Box 15100, 00076 Aalto, Finland.
authors.forename: A J
authors.initials: AJ
authors.lastname: Moilanen
authors.affiliation: COMP Centre of Excellence, Department of Applied Physics, Aalto University, PO Box 15100, 00076 Aalto, Finland paivi.torma@aalto.fi.
authors.forename: P
authors.initials: P
authors.lastname: Törmä
keywords: coupled dipole approximation; nanoparticle array; plasmonics