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STEM-EELS analysis of multipole surface plasmon modes in symmetry-broken AuAg nanowire dimers

Schubert, Ina and Sigle, Wilfried and van Aken, Peter A. and Trautmann, Christina and Toimil-Molares, Maria Eugenia (2015):
STEM-EELS analysis of multipole surface plasmon modes in symmetry-broken AuAg nanowire dimers.
In: Nanoscale, RSC Publishing, pp. 4935-4941, 7, (11), ISSN 2040-3364,
[Online-Edition: http://dx.doi.org/10.1039/C4NR06578F],
[Article]

Abstract

Surface plasmon coupling in nanowires separated by small gaps generates high field enhancements at the position of the gap and is thus of great interest for sensing applications. It is known that the nanowire dimensions and in particular the symmetry of the structures has strong influence on the plasmonic properties of the dimer structure. Here, we report on multipole surface plasmon coupling in symmetry-broken AuAg nanowire dimers. Our dimers, consisting of two nanowires with different lengths and separated by gaps of only 10 to 30 nm, were synthesized by pulsed electrochemical deposition in ion track-etched polymer templates. Electron energy-loss spectroscopy in scanning transmission electron microscopy allows us to resolve up to nine multipole order surface plasmon modes of these dimers spectrally separated from each other. The spectra evidence plasmon coupling between resonances of different multipole order, resulting in the generation of additional plasmonic modes. Since such complex structures require elaborated synthesis techniques, dimer structures with complex composition, morphology and shape are created. We demonstrate that finite element simulations on pure Au dimers can predict the generated resonances in the fabricated structures. The excellent agreement of our experiment on AuAg dimers with finite integration simulations using CST microwave studio manifests great potential to design complex structures for sensing applications.

Item Type: Article
Erschienen: 2015
Creators: Schubert, Ina and Sigle, Wilfried and van Aken, Peter A. and Trautmann, Christina and Toimil-Molares, Maria Eugenia
Title: STEM-EELS analysis of multipole surface plasmon modes in symmetry-broken AuAg nanowire dimers
Language: English
Abstract:

Surface plasmon coupling in nanowires separated by small gaps generates high field enhancements at the position of the gap and is thus of great interest for sensing applications. It is known that the nanowire dimensions and in particular the symmetry of the structures has strong influence on the plasmonic properties of the dimer structure. Here, we report on multipole surface plasmon coupling in symmetry-broken AuAg nanowire dimers. Our dimers, consisting of two nanowires with different lengths and separated by gaps of only 10 to 30 nm, were synthesized by pulsed electrochemical deposition in ion track-etched polymer templates. Electron energy-loss spectroscopy in scanning transmission electron microscopy allows us to resolve up to nine multipole order surface plasmon modes of these dimers spectrally separated from each other. The spectra evidence plasmon coupling between resonances of different multipole order, resulting in the generation of additional plasmonic modes. Since such complex structures require elaborated synthesis techniques, dimer structures with complex composition, morphology and shape are created. We demonstrate that finite element simulations on pure Au dimers can predict the generated resonances in the fabricated structures. The excellent agreement of our experiment on AuAg dimers with finite integration simulations using CST microwave studio manifests great potential to design complex structures for sensing applications.

Journal or Publication Title: Nanoscale
Volume: 7
Number: 11
Publisher: RSC Publishing
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Ion-Beam-Modified Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 02 Jul 2015 09:06
Official URL: http://dx.doi.org/10.1039/C4NR06578F
Identification Number: doi:10.1039/C4NR06578F
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