title: Plasmon-induced doping of graphene.
abstract: A metallic nanoantenna, under resonant illumination, injects nonequilibrium hot electrons into a nearby graphene structure, effectively doping the material. A prominent change in carrier density was observed for a plasmonic antenna-patterned graphene sheet following laser excitation, shifting the Dirac point, as determined from the gate-controlled transport characteristic. The effect is due to hot electron generation resulting from the decay of the nanoantenna plasmon following resonant excitation. The effect is highly tunable, depending on the resonant frequency of the plasmonic antenna, as well as on the incident laser power. Hot electron-doped graphene represents a new type of hybrid material that shows great promise for optoelectronic device applications.
authors.affiliation: Department of Electrical and Computer Engineering, Laboratory for Nanophotonics, Rice University, Houston, Texas 77005, United States. zf4@rice.edu
authors.forename: Zheyu
authors.initials: Z
authors.lastname: Fang
authors.forename: Yumin
authors.initials: Y
authors.lastname: Wang
authors.forename: Zheng
authors.initials: Z
authors.lastname: Liu
authors.forename: Andrea
authors.initials: A
authors.lastname: Schlather
authors.forename: Pulickel M
authors.initials: PM
authors.lastname: Ajayan
authors.forename: Frank H L
authors.initials: FH
authors.lastname: Koppens
authors.forename: Peter
authors.initials: P
authors.lastname: Nordlander
authors.forename: Naomi J
authors.initials: NJ
authors.lastname: Halas
mesh_terms: D006108:Graphite; D008027:Light; D008422:Materials Testing; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure*; D012542:Scattering, Radiation; D020349:Surface Plasmon Resonance / Q000379:methods*
chemical_list: D006108:Graphite