Berlin 2012 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 34: Poster Session I (Graphene; Plasmonics and nanooptics; Coherence and coherent control in nanophotonics and plasmonics)
O 34.35: Poster
Dienstag, 27. März 2012, 18:15–21:45, Poster E
A Point-Dipole Model for fast Computation of Plasmonic Structures and Nanoantennas — •Thorsten Schumacher1,2, Mario Hentschel1,2, Harald Giessen2, and Markus Lippitz1,2 — 1Max Planck Institute for Solid State Research, Stuttgart — 24th Physics Institute, University of Stuttgart
Optical nanoantennas based on plasmonic nanostructures are a novel tool to investigate previously inaccessible single nanoobjects [ref. Natcom]. Here the optical and geometric properties of the nanoantenna play an important role and have to be designed very accurately to achieve the desired effects. Several numerical methods such as FEM, FDTD, or multiple multipoles (MMP) are available to compute the linear optical behavior of such plasmonic nanostructures. They all have in common, that the required computation time is relatively long and that a deeper understanding of the coupling behavior is not obtained. Here we present a simple and very fast alternative to these methods to predict the coupling behavior of plasmonic nanoparticles in dependence of their spatial arrangement and individual plasmonic eigenmodes. Our approach is based on the discrete dipole approximation with a maximum reduction of used dipoles. We show the range of validity and demonstrate how our method can be used to obtain a deeper understanding of plasmonic interactions in complex nanostructures.