title: Highly localized non-linear optical white-light response at nanorod ends from non-resonant excitation.
abstract: We investigate gold nanorods that are excited non-resonantly using a femtosecond 800 nm pulsed laser beam. We find that they emit very localized white light--two-photon induced photoluminescence (PL)--spatially confined in the optical far-field with a full-width-at-half-maximum of 138 nm (x-y plane) and 328 nm (z-plane). The PL spectrum is characterized to show at least two components--a second-harmonic peak and an intrinsic gold interband transition.
authors.affiliation: Lichttechnisches Institut (LTI), DFG Heisenberg Group Nanoscale Science, Karlsruher Institut für Technologie-KIT, Germany.
authors.forename: Matthias D
authors.initials: MD
authors.lastname: Wissert
authors.forename: Konstantin S
authors.initials: KS
authors.lastname: Ilin
authors.forename: Michael
authors.initials: M
authors.lastname: Siegel
authors.forename: Uli
authors.initials: U
authors.lastname: Lemmer
authors.forename: Hans-Jürgen
authors.initials: HJ
authors.lastname: Eisler