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Mapping Localized Surface Plasmons within Silver Nanocubes Using Cathodoluminescence Hyperspectral Imaging.

Paul R Edwards¹, David Sleith, Alastair W Wark

¹Department of Physics, SUPA, University of Strathclyde , 107 Rottenrow, Glasgow G4 0NG, U.K.

The Journal of Physical Chemistry. C, Nanomaterials and Interfaces

|May 28, 2013

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Researchers studied localized surface plasmons in silver nanocubes using cathodoluminescence imaging. They mapped distinct spectral features, confirming theoretical predictions about luminescence from cube faces, edges, and vertices.

Area of Science:

Nanotechnology
Materials Science
Optics

Background:

Localized surface plasmons (LSPs) in metallic nanoparticles exhibit unique optical properties.
Silver nanocubes are of interest due to their tunable plasmonic behavior.

Purpose of the Study:

To investigate LSPs in silver nanocubes smaller than 50 nm.
To map the spatial distribution of luminescence features.

Main Methods:

High-resolution cathodoluminescence hyperspectral imaging.
Multivariate statistical analysis of luminescence data.

Main Results:

Distinct spectral features were identified and spatially mapped.
A 490-nm peak was observed from cube faces.

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Shorter-wavelength luminescence originated from vertices and edges.

Conclusions:

Direct experimental evidence confirms theoretical predictions of LSP behavior in silver nanocubes.
The study demonstrates the utility of cathodoluminescence hyperspectral imaging for analyzing plasmonic nanostructures.