title: Plasmon scattering from single subwavelength holes.
abstract: We map the complex electric fields associated with the scattering of surface plasmon polaritons by single subwavelength holes of different sizes in thick gold films. We identify and quantify the different modes associated with this event, including a radial surface wave with an angularly isotropic amplitude. This wave is shown to arise from the out-of-plane electric dipole induced in the hole, and we quantify the corresponding polarizability, which is in excellent agreement with electromagnetic theory. Time-resolved measurements reveal a time delay of 38±18  fs between the surface plasmon polariton and the radial wave, which we attribute to the interaction with a broad hole resonance.
authors.affiliation: Center for Nanophotonics, FOM Institute AMOLF, Science Park 104, 1098 XG, Amsterdam, The Netherlands. rotenberg@amolf.nl
authors.forename: N
authors.initials: N
authors.lastname: Rotenberg
authors.forename: M
authors.initials: M
authors.lastname: Spasenović
authors.forename: T L
authors.initials: TL
authors.lastname: Krijger
authors.forename: B
authors.initials: B
authors.lastname: le Feber
authors.forename: F J
authors.initials: FJ
authors.lastname: García de Abajo
authors.forename: L
authors.initials: L
authors.lastname: Kuipers