title: Nonlinear photoluminescence spectrum of single gold nanostructures.
abstract: We investigate the multiphoton photoluminescence characteristics of gold nanoantennas fabricated from single crystals and polycrystalline films. By exciting these nanostructures with ultrashort pulses tunable in the near-infrared range, we observe distinct features in the broadband photoluminescence spectrum. By comparing antennas of different crystallinity and shape, we demonstrate that the nanoscopic geometry of plasmonic devices determines the shape of the emission spectra. Our findings rule out the contribution of the gold band structure in shaping the photoluminescence.
authors.affiliation: Department of Physics and Center for Applied Photonics, University of Konstanz , D-78457 Konstanz, Germany.
authors.forename: Vanessa
authors.initials: V
authors.lastname: Knittel
authors.forename: Marco P
authors.initials: MP
authors.lastname: Fischer
authors.forename: Tjaard
authors.initials: T
authors.lastname: de Roo
authors.forename: Stefan
authors.initials: S
authors.lastname: Mecking
authors.forename: Alfred
authors.initials: A
authors.lastname: Leitenstorfer
authors.forename: Daniele
authors.initials: D
authors.lastname: Brida
keywords: multiphoton processes; nanoantennas; nanoplasmonics; nonlinear optics; photoluminescence; third-harmonic generation