title: Towards the origin of the nonlinear response in hybrid plasmonic systems.
abstract: Plasmonic systems are known for their distinct nonlinear optical properties when compared to purely dielectric materials. Although it is well accepted that the enhanced nonlinear processes in plasmonic-dielectric compounds are related to the excitation of localized plasmon resonances, their exact origin is concealed by the local field enhancement in the surrounding material and the nonlinearity in the metal. Here, we show that the origin of third-harmonic generation in hybrid plasmonic-dielectric compounds can be unambiguously identified from the shape of the nonlinear spectrum.
authors.affiliation: 4th Physics Institute and Research Center SCoPE, University of Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany.
authors.forename: Tobias
authors.initials: T
authors.lastname: Utikal
authors.forename: Thomas
authors.initials: T
authors.lastname: Zentgraf
authors.forename: Thomas
authors.initials: T
authors.lastname: Paul
authors.forename: Carsten
authors.initials: C
authors.lastname: Rockstuhl
authors.forename: Falk
authors.initials: F
authors.lastname: Lederer
authors.forename: Markus
authors.initials: M
authors.lastname: Lippitz
authors.forename: Harald
authors.initials: H
authors.lastname: Giessen