Title

Interparticle Electromagnetic Coupling In Assembled Gold-Necklace Nanoparticles

Abstract

A unique phenomenon of interparticle electromagnetic coupling in closely spaced gold nanoparticles has been observed by probing the ultrafast electron dynamics of spherical gold nanoparticles with those of a gold-necklace nanoparticle system. Electron-electron scattering and electron-phonon relaxation (two main aspects of electron dynamics) are found to be significantly different for gold-necklace particles when compared to spherical gold nanoparticles. On inter band gap excitation, appreciably slower and pump-power independent electron-electron scattering has been observed for necklace particles (∼500 fs for Au-neck compared to ∼200 fs for Au-spherical nanoparticles). Significantly slower pump-power dependent electron-phonon relaxation has also been observed for the necklace particle system. The electron dynamics for gold-necklace particles is quite unique, and existing models of electron-electron scattering and electron-phonon relaxation were unsuccessful in explaining the dynamics in this system. The results are thus explained by incorporating efficient dipolar electronic coupling between the neighboring nanoparticles. Copyright © 2007 American Chemical Society.

Publication Date

2-21-2007

Publication Title

Journal of the American Chemical Society

Volume

129

Issue

7

Number of Pages

1848-1849

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1021/ja067123p

Socpus ID

33847289714 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/33847289714

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