title: Enhanced plasmonic properties of gold-catalysed semiconductor nanowires.
abstract: A key challenge for the development of plasmonic nanodevices is their integration into active semiconducting structures. Gold-catalysed semiconductor nanowires are promising candidates for their bottom-up growth process that aligns a single gold nanoparticle at each nanowire apex. Unfortunately these show extremely poor plasmonic properties. In this work, we propose a way to enhance their plasmonic resonance up to those of ideal and isolated gold nanoparticles. A suitable purification protocol compatible with GaAs and ZnSe molecular beam epitaxy of nanowires is used to produce plasmonic active nanowires, which were used to enhance the Raman signal of pentacene and graphene oxide. Enhancement factors up to three orders of magnitude are demonstrated.
authors.affiliation: IOM-CNR Laboratorio TASC, AREA Science Park, Basovizza, 34139 Trieste, Italy. naumenko@iom.cnr.it.
authors.forename: Denys
authors.initials: D
authors.lastname: Naumenko
authors.forename: Valentina
authors.initials: V
authors.lastname: Zannier
authors.forename: Vincenzo
authors.initials: V
authors.lastname: Grillo
authors.forename: Damiano
authors.initials: D
authors.lastname: Cassese
authors.forename: Giacomo
authors.initials: G
authors.lastname: Priante
authors.forename: Simone
authors.initials: S
authors.lastname: dal Zilio
authors.forename: Silvia
authors.initials: S
authors.lastname: Rubini
authors.forename: Marco
authors.initials: M
authors.lastname: Lazzarino