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Multipole Surface Plasmon Resonances in Conductively Coupled Metal Nanowire Dimers

Alber, Ina and Sigle, Wilfried and Demming-Janssen, Frank and Neumann, Reinhard and Trautmann, Christina and van Aken, Peter A. and Toimil-Molares, Maria Eugenia (2012):
Multipole Surface Plasmon Resonances in Conductively Coupled Metal Nanowire Dimers.
In: ACS Nano, ACS Publications, pp. 9711-9717, 6, (11), ISSN 1936-0851,
[Online-Edition: http://dx.doi.org/10.1021/nn303149p],
[Article]

Abstract

We report on the experimental and the theoretical investigation of multipole surface plasmon resonances in metal nanowires conductively connected by small junctions. The influence of a conductive junction on the resonance energies of nanowire dimers was simulated using the finite element method based software CST Microwave Studio and experimentally measured by electron energy-loss spectroscopy in a transmission electron microscope. We extend the analysis of conductively connected structures to higher order multipole modes up to third order, including dark modes. Our results reveal that an increase in junction size does not shift significantly the antibonding modes, but causes a strong blue shift of the bonding modes, leading to an energetic rearrangement of the modes compared to those of a capacitively coupled dimer with similar dimensions.

Item Type: Article
Erschienen: 2012
Creators: Alber, Ina and Sigle, Wilfried and Demming-Janssen, Frank and Neumann, Reinhard and Trautmann, Christina and van Aken, Peter A. and Toimil-Molares, Maria Eugenia
Title: Multipole Surface Plasmon Resonances in Conductively Coupled Metal Nanowire Dimers
Language: English
Abstract:

We report on the experimental and the theoretical investigation of multipole surface plasmon resonances in metal nanowires conductively connected by small junctions. The influence of a conductive junction on the resonance energies of nanowire dimers was simulated using the finite element method based software CST Microwave Studio and experimentally measured by electron energy-loss spectroscopy in a transmission electron microscope. We extend the analysis of conductively connected structures to higher order multipole modes up to third order, including dark modes. Our results reveal that an increase in junction size does not shift significantly the antibonding modes, but causes a strong blue shift of the bonding modes, leading to an energetic rearrangement of the modes compared to those of a capacitively coupled dimer with similar dimensions.

Journal or Publication Title: ACS Nano
Volume: 6
Number: 11
Publisher: ACS Publications
Uncontrolled Keywords: multipole order surface plasmon, nanowire dimer, conductive junction, electron energy-loss spectroscopy, finite element simulation, bonding mode, antibonding mode
Divisions: 11 Department of Materials and Earth Sciences > Earth Science
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 20 Mar 2014 12:59
Official URL: http://dx.doi.org/10.1021/nn303149p
Identification Number: doi:10.1021/nn303149p
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