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Substrate-mediated charge transfer plasmons in simple and complex nanoparticle clusters.
|Title||Substrate-mediated charge transfer plasmons in simple and complex nanoparticle clusters.|
|Publication Type||Journal Article|
|Year of Publication||2013|
|Authors||Wang Y, Li Z, Zhao K, Sobhani A, Zhu X, Fang Z, Halas NJ|
|Date Published||2013 Oct 21|
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.