Journal
NANOSCALE
Volume 5, Issue 20, Pages 9897-9901Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3nr02835f
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Funding
- Robert A. Welch foundation [C-1220]
- Air Force Office of Scientific Research [FA9550-10-1-0469]
- Office of Naval Research [N00014-10-1-0989]
- DoD NSSEFF [N00244-09-1-0067]
- Defense Threat Reduction Agency (DTRA) [HDTRA1-11-1-0040]
- National Basic Research Program of China (973 Program) [2007CB936800]
- National Natural Science Foundation of China [61176120]
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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.
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