Substrate-mediated charge transfer plasmons in simple and complex nanoparticle clusters.

TitleSubstrate-mediated charge transfer plasmons in simple and complex nanoparticle clusters.
Publication TypeJournal Article
Year of Publication2013
AuthorsWang Y, Li Z, Zhao K, Sobhani A, Zhu X, Fang Z, Halas NJ
JournalNanoscale
Volume5
Issue20
Pagination9897-901
Date Published2013 Oct 21
Abstract

A conductive substrate can provide a simple and straightforward way to induce charge-transfer plasmon modes in Au nanoparticle clusters. For a simple dimer structure, a remarkably narrow charge transfer plasmon, which differs dramatically from the dipolar plasmon mode of the electrically isolated nanostructure, is clearly observed. For a more complex nonamer cluster that supports a strong Fano resonance on an insulating substrate, a mixed charge transfer-dipole mode is observed, where charge transfer is induced on the outer nanoparticles, establishing an opposing dipole on the intervening central particles, resulting in a strongly damped far field response.

DOI10.1155/2013/756012
Alternate JournalNanoscale