title: A bimetallic nanoantenna for directional colour routing.
abstract: Recent progress in nanophotonics includes demonstrations of meta-materials displaying negative refraction at optical frequencies, directional single photon sources, plasmonic analogies of electromagnetically induced transparency and spectacular Fano resonances. The physics behind these intriguing effects is to a large extent governed by the same single parameter-optical phase. Here we describe a nanophotonic structure built from pairs of closely spaced gold and silver disks that show phase accumulation through material-dependent plasmon resonances. The bimetallic dimers show exotic optical properties, in particular scattering of red and blue light in opposite directions, in spite of being as compact as ∼λ(3)/100. These spectral and spatial photon-sorting nanodevices can be fabricated on a wafer scale and offer a versatile platform for manipulating optical response through polarization, choice of materials and geometrical parameters, thereby opening possibilities for a wide range of practical applications.
authors.affiliation: Department of Applied Physics, Chalmers University of Technology, Göteborg, Sweden. timurs@chalmers.se
authors.forename: Timur
authors.initials: T
authors.lastname: Shegai
authors.forename: Si
authors.initials: S
authors.lastname: Chen
authors.forename: Vladimir D
authors.initials: VD
authors.lastname: Miljković
authors.forename: Gülis
authors.initials: G
authors.lastname: Zengin
authors.forename: Peter
authors.initials: P
authors.lastname: Johansson
authors.forename: Mikael
authors.initials: M
authors.lastname: Käll