title: Delocalization of Nonlinear Optical Responses in Plasmonic Nanoantennas.
abstract: Remote excitation and emission of two-photon luminescence and second-harmonic generation are observed in micrometer long gold rod optical antennas upon local illumination with a tightly focused near-infrared femtosecond laser beam. We show that these nonlinear radiations are emitted from the entire antenna and the measured far-field angular patterns bear the information regarding the nature and origins of the respective nonlinear processes. We demonstrate that the nonlinear responses are locally induced by a propagating surface plasmon at the excitation frequency, enabling thereby a polariton-mediated spatial tailoring and design of coherent and incoherent nonlinear responses.
authors.affiliation: Laboratoire Interdisciplinaire Carnot de Bourgogne CNRS-UMR 6303, Université Bourgogne Franche-Comté, 21078 Dijon, France.
authors.forename: Sviatlana
authors.initials: S
authors.lastname: Viarbitskaya
authors.affiliation: Laboratoire Interdisciplinaire Carnot de Bourgogne CNRS-UMR 6303, Université Bourgogne Franche-Comté, 21078 Dijon, France.
authors.forename: Olivier
authors.initials: O
authors.lastname: Demichel
authors.affiliation: Laboratoire Interdisciplinaire Carnot de Bourgogne CNRS-UMR 6303, Université Bourgogne Franche-Comté, 21078 Dijon, France.
authors.forename: Benoit
authors.initials: B
authors.lastname: Cluzel
authors.affiliation: Laboratoire Interdisciplinaire Carnot de Bourgogne CNRS-UMR 6303, Université Bourgogne Franche-Comté, 21078 Dijon, France.
authors.forename: Gérard
authors.initials: G
authors.lastname: Colas des Francs
authors.affiliation: Laboratoire Interdisciplinaire Carnot de Bourgogne CNRS-UMR 6303, Université Bourgogne Franche-Comté, 21078 Dijon, France.
authors.forename: Alexandre
authors.initials: A
authors.lastname: Bouhelier