title: Controlling the optical near field of nanoantennas with spatial phase-shaped beams.
abstract: We report on a novel approach, based on sub-wavelength spatial phase variations at the focus of high-order beams, to reconfigure the optical near field distribution near plasmonic nanostructures. We first show how the introduction of phase jumps in the incident field driving a gap nanoantenna strongly affects its near field response. Beyond, we demonstrate the feasibility of exploiting this approach to selectively switch on and off hot-spots sites within a complex antenna architecture.
authors.affiliation: ICFO-Institut de Ciencies Fotoniques, Mediterranean Technology Park, 08860 Castelldefels, Barcelona, Spain.
authors.forename: Giorgio
authors.initials: G
authors.lastname: Volpe
authors.forename: Sudhir
authors.initials: S
authors.lastname: Cherukulappurath
authors.forename: Roser
authors.initials: R
authors.lastname: Juanola Parramon
authors.forename: Gabriel
authors.initials: G
authors.lastname: Molina-Terriza
authors.forename: Romain
authors.initials: R
authors.lastname: Quidant