title: Atomically localized plasmon enhancement in monolayer graphene.
abstract: Plasmons in graphene can be tuned by using electrostatic gating or chemical doping, and the ability to confine plasmons in very small regions could have applications in optoelectronics, plasmonics and transformation optics. However, little is known about how atomic-scale defects influence the plasmonic properties of graphene. Moreover, the smallest localized plasmon resonance observed in any material to date has been limited to around 10 nm. Here, we show that surface plasmon resonances in graphene can be enhanced locally at the atomic scale. Using electron energy-loss spectrum imaging in an aberration-corrected scanning transmission electron microscope, we find that a single point defect can act as an atomic antenna in the petahertz (10(15) Hz) frequency range, leading to surface plasmon resonances at the subnanometre scale.
authors.affiliation: Department of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235, USA. wu.zhou@vanderbilt.edu
authors.forename: Wu
authors.initials: W
authors.lastname: Zhou
authors.forename: Jaekwang
authors.initials: J
authors.lastname: Lee
authors.forename: Jagjit
authors.initials: J
authors.lastname: Nanda
authors.forename: Sokrates T
authors.initials: ST
authors.lastname: Pantelides
authors.forename: Stephen J
authors.initials: SJ
authors.lastname: Pennycook
authors.forename: Juan-Carlos
authors.initials: JC
authors.lastname: Idrobo