title: High-efficiency second harmonic generation from a single hybrid ZnO nanowire/Au plasmonic nano-oligomer.
abstract: We introduce a plasmonic-semiconductor hybrid nanosystem, consisting of a ZnO nanowire coupled to a gold pentamer oligomer by crossing the hot-spot. It is demonstrated that the hybrid system exhibits a second harmonic (SH) conversion efficiency of ∼3 × 10(-5)%, which is among the highest values for a nanoscale object at optical frequencies reported so far. The SH intensity was found to be ∼1700 times larger than that from the same nanowire excited outside the hot-spot. Placing high nonlinear susceptibility materials precisely in plasmonic confined-field regions to enhance SH generation opens new perspectives for highly efficient light frequency up-conversion on the nanoscale.
authors.affiliation: Laboratorio de Electrónica Cuántica, Dep. de Física, FCEN-IFIBA CONICET, Universidad de Buenos Aires , Intendente Güiraldes 2160, C1428EGA, Buenos Aires, Argentina.
authors.forename: Gustavo
authors.initials: G
authors.lastname: Grinblat
authors.forename: Mohsen
authors.initials: M
authors.lastname: Rahmani
authors.forename: Emiliano
authors.initials: E
authors.lastname: Cortés
authors.forename: Martín
authors.initials: M
authors.lastname: Caldarola
authors.forename: David
authors.initials: D
authors.lastname: Comedi
authors.forename: Stefan A
authors.initials: SA
authors.lastname: Maier
authors.forename: Andrea V
authors.initials: AV
authors.lastname: Bragas
keywords: Plasmonic nano-oligomer; ZnO nanowire; field enhancement; photonic-plasmonic coupling; second harmonic generation (SHG)