title: Surface plasmon interference excited by tightly focused laser beams.
abstract: We show that interfering surface plasmon polaritons can be excited with a focused laser beam at normal incidence to a plane metal film. No protrusions or holes are needed in this excitation scheme. Depending on the axial position of the focus, the intensity distribution on the metal surface is either dominated by interferences between counterpropagating plasmons or by a two-lobe pattern characteristic of localized surface plasmon excitation. Our experiments can be accurately explained by use of the angular spectrum representation and provide a simple means for locally exciting standing surface plasmon polaritons.
authors.affiliation: Institut Carnot de Bourgogne, CNRS-UMR 5209, Université de Bourgogne, 21078 Dijon, France. alexandre.bouhelier@u-bourgogne.fr
authors.forename: A
authors.initials: A
authors.lastname: Bouhelier
authors.forename: F
authors.initials: F
authors.lastname: Ignatovich
authors.forename: A
authors.initials: A
authors.lastname: Bruyant
authors.forename: C
authors.initials: C
authors.lastname: Huang
authors.forename: G
authors.initials: G
authors.lastname: Colas des Francs
authors.forename: J-C
authors.initials: JC
authors.lastname: Weeber
authors.forename: A
authors.initials: A
authors.lastname: Dereux
authors.forename: G P
authors.initials: GP
authors.lastname: Wiederrecht
authors.forename: L
authors.initials: L
authors.lastname: Novotny