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Visualization of Multipolar Longitudinal and Transversal Surface Plasmon Modes in Nanowire Dimers

Alber, Ina and Sigle, Wilfried and Müller, Sven and Neumann, Reinhard and Picht, Oliver and Rauber, Markus and van Aken, Peter A. and Toimil-Molares, Maria Eugenia (2011):
Visualization of Multipolar Longitudinal and Transversal Surface Plasmon Modes in Nanowire Dimers.
In: ACS Nano, ACS Publications, pp. 9845-9853, 5, (12), [Online-Edition: http://dx.doi.org/10.1021/nn2035044],
[Article]

Abstract

We study the transversal and longitudinal localized surface plasmon resonances in single nanowires and nanowire dimers excited by the fast traveling electron beam in a transmission electron microscope equipped with high-resolution electron energy-loss spectroscopy. Bright and dark longitudinal modes up to the fifth order are resolved on individual metallic nanowires. On nanowire dimers, mode splitting into bonding and antibonding is measured up to the third order for several dimers with various aspect ratio and controlled gap size. We observe that the electric field maxima of the bonding modes are shifted toward the gap, while the electric field maxima of the antibonding modes are shifted toward the dimer ends. Finally, we observe that the transversal mode is not detected in the region of the dimer gap and decays away from the rod more rapidly than the longitudinal modes.

Item Type: Article
Erschienen: 2011
Creators: Alber, Ina and Sigle, Wilfried and Müller, Sven and Neumann, Reinhard and Picht, Oliver and Rauber, Markus and van Aken, Peter A. and Toimil-Molares, Maria Eugenia
Title: Visualization of Multipolar Longitudinal and Transversal Surface Plasmon Modes in Nanowire Dimers
Language: English
Abstract:

We study the transversal and longitudinal localized surface plasmon resonances in single nanowires and nanowire dimers excited by the fast traveling electron beam in a transmission electron microscope equipped with high-resolution electron energy-loss spectroscopy. Bright and dark longitudinal modes up to the fifth order are resolved on individual metallic nanowires. On nanowire dimers, mode splitting into bonding and antibonding is measured up to the third order for several dimers with various aspect ratio and controlled gap size. We observe that the electric field maxima of the bonding modes are shifted toward the gap, while the electric field maxima of the antibonding modes are shifted toward the dimer ends. Finally, we observe that the transversal mode is not detected in the region of the dimer gap and decays away from the rod more rapidly than the longitudinal modes.

Journal or Publication Title: ACS Nano
Volume: 5
Number: 12
Publisher: ACS Publications
Uncontrolled Keywords: transversal surface plasmon resonance; longitudinal surface plasmon resonances; bonding multipol order modes; antibonding multipol order modes; electron energy-loss spectroscopy; nanowire dimer synthesis
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Material Analytics
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 08 Mar 2012 16:17
Official URL: http://dx.doi.org/10.1021/nn2035044
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