title: Edge and Surface Plasmons in Graphene Nanoribbons.
abstract: We report on nano-infrared (IR) imaging studies of confined plasmon modes inside patterned graphene nanoribbons (GNRs) fabricated with high-quality chemical-vapor-deposited (CVD) graphene on Al2O3 substrates. The confined geometry of these ribbons leads to distinct mode patterns and strong field enhancement, both of which evolve systematically with the ribbon width. In addition, spectroscopic nanoimaging in the mid-infrared range 850-1450 cm(-1) allowed us to evaluate the effect of the substrate phonons on the plasmon damping. Furthermore, we observed edge plasmons: peculiar one-dimensional modes propagating strictly along the edges of our patterned graphene nanostructures.
authors.affiliation: Department of Physics, University of California, San Diego , La Jolla, California 92093, United States.|Department of Physics and Astronomy, Iowa State University , Ames, Iowa 50011, United States.
authors.forename: Z
authors.initials: Z
authors.lastname: Fei
authors.affiliation: Department of Physics, University of California, San Diego , La Jolla, California 92093, United States.
authors.forename: M D
authors.initials: MD
authors.lastname: Goldflam
authors.affiliation: Department of Physics, University of California, San Diego , La Jolla, California 92093, United States.
authors.forename: J-S
authors.initials: JS
authors.lastname: Wu
authors.affiliation: Department of Physics, University of California, San Diego , La Jolla, California 92093, United States.
authors.forename: S
authors.initials: S
authors.lastname: Dai
authors.affiliation: Department of Physics, University of California, San Diego , La Jolla, California 92093, United States.
authors.forename: M
authors.initials: M
authors.lastname: Wagner
authors.affiliation: Department of Physics, University of California, San Diego , La Jolla, California 92093, United States.
authors.forename: A S
authors.initials: AS
authors.lastname: McLeod
authors.affiliation: Department of Physics, Stony Brook University , Stony Brook, New York 11790, United States.
authors.forename: M K
authors.initials: MK
authors.lastname: Liu
authors.affiliation: Department of Physics, University of California, San Diego , La Jolla, California 92093, United States.
authors.forename: K W
authors.initials: KW
authors.lastname: Post
authors.affiliation: Department of Precision and Microsystems Engineering, Delft University of Technology , Mekelweg 2, 2628 CD Delft, Netherlands.
authors.forename: S
authors.initials: S
authors.lastname: Zhu
authors.affiliation: Department of Precision and Microsystems Engineering, Delft University of Technology , Mekelweg 2, 2628 CD Delft, Netherlands.
authors.forename: G C A M
authors.initials: GC
authors.lastname: Janssen
authors.affiliation: Department of Physics, University of California, San Diego , La Jolla, California 92093, United States.
authors.forename: M M
authors.initials: MM
authors.lastname: Fogler
authors.affiliation: Department of Physics, University of California, San Diego , La Jolla, California 92093, United States.
authors.forename: D N
authors.initials: DN
authors.lastname: Basov
keywords: CVD graphene; Graphene nanoribbons; edge plasmons; nano-infrared imaging; plasmon−phonon coupling