Plasmonic Optical Responses of Metals Supported by Graphene

Optical responses of metallic nanostructures supported on graphene substrates are described. Alkali metal thin films exhibit strong absorption in the visible region due to multipole plasmon, which show anomalously long coherence decay time. Deposition of silver and indium atoms leads to their cluster formation, which exhibits localized surface plasmon resonance in the UV and far-UV regions, respectively. Plexciton formations between molecular transitions and the localized surface plasmons of these clusters are studied.