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Evaluating Plasmonic Transport in Current-carrying Silver Nanowires

Evaluating Plasmonic Transport in Current-carrying Silver Nanowires

Published on: December 11, 2013

Dark plasmonic breathing modes in silver nanodisks.

Franz-Philipp Schmidt¹, Harald Ditlbacher, Ulrich Hohenester

¹Institute for Electron Microscopy and Fine Structure Research (FELMI), Graz University of Technology, 8010 Graz, Austria. franz.schmidt@felmi-zfe.at

|October 3, 2012

Summary

We discovered a new plasmonic mode in silver nanodisks using electron energy loss spectroscopy. This radial breathing mode, undetectable by light, has strong near-field effects relevant for nanoparticle interactions and quantum emitters.

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Area of Science:

Plasmonics
Nanotechnology
Materials Science

Background:

Surface plasmons in metallic nanostructures are crucial for optical and electronic applications.
Understanding the full plasmonic spectrum, including dark modes, is essential for advanced nanophotonics.

Purpose of the Study:

To comprehensively map the plasmonic spectrum of silver nanodisks.
To identify and characterize plasmon modes that do not couple to light.

Main Methods:

Electron energy loss spectroscopy (EELS) was employed to probe the plasmonic excitations.
Analysis focused on identifying modes with radial symmetry and their coupling characteristics.

Main Results:

A dominant plasmon mode with radial symmetry and no net dipole moment was identified.

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This mode, termed the radial breathing mode, does not couple to light and has been unobserved in optical experiments.

The mode exhibits characteristics of a 2D surface plasmon confined by the nanodisk geometry.

Conclusions:

The radial breathing mode possesses strong near-field properties.
This mode significantly influences plasmon hybridization in coupled nanoparticle systems.
Potential applications include enhanced coupling with quantum emitters.