title: Measurement of Nanoplasmonic Field Enhancement with Ultrafast Photoemission.
abstract: Probing nanooptical near-fields is a major challenge in plasmonics. Here, we demonstrate an experimental method utilizing ultrafast photoemission from plasmonic nanostructures that is capable of probing the maximum nanoplasmonic field enhancement in any metallic surface environment. Directly measured field enhancement values for various samples are in good agreement with detailed finite-difference time-domain simulations. These results establish ultrafast plasmonic photoelectrons as versatile probes for nanoplasmonic near-fields.
authors.affiliation: MTA "Lendület" Ultrafast Nanooptics Group, Wigner Research Centre for Physics , 1121 Budapest, Hungary.
authors.forename: Péter
authors.initials: P
authors.lastname: Rácz
authors.affiliation: ELI-ALPS Research Institute , ELI-HU Nonprofit Kft., 6720 Szeged, Hungary.|Department of Optics and Quantum Electronics, University of Szeged , 6720 Szeged, Hungary.
authors.forename: Zsuzsanna
authors.identifier: 0000-0003-3567-6468
authors.initials: Z
authors.lastname: Pápa
authors.affiliation: MTA "Lendület" Ultrafast Nanooptics Group, Wigner Research Centre for Physics , 1121 Budapest, Hungary.
authors.forename: István
authors.initials: I
authors.lastname: Márton
authors.affiliation: ELI-ALPS Research Institute , ELI-HU Nonprofit Kft., 6720 Szeged, Hungary.|Department of Optics and Quantum Electronics, University of Szeged , 6720 Szeged, Hungary.
authors.forename: Judit
authors.initials: J
authors.lastname: Budai
authors.affiliation: Faculty of Physics, University of Warsaw , 02-093 Warsaw, Poland.
authors.forename: Piotr
authors.initials: P
authors.lastname: Wróbel
authors.affiliation: Faculty of Physics, University of Warsaw , 02-093 Warsaw, Poland.
authors.forename: Tomasz
authors.initials: T
authors.lastname: Stefaniuk
authors.affiliation: Institut für Physik, Karl-Franzens Universität Graz , 8010 Graz, Austria.
authors.forename: Christine
authors.initials: C
authors.lastname: Prietl
authors.affiliation: Institut für Physik, Karl-Franzens Universität Graz , 8010 Graz, Austria.
authors.forename: Joachim R
authors.initials: JR
authors.lastname: Krenn
authors.affiliation: MTA "Lendület" Ultrafast Nanooptics Group, Wigner Research Centre for Physics , 1121 Budapest, Hungary.|ELI-ALPS Research Institute , ELI-HU Nonprofit Kft., 6720 Szeged, Hungary.
authors.forename: Péter
authors.identifier: 0000-0002-0736-3512
authors.initials: P
authors.lastname: Dombi
mesh_terms: D004574:Electromagnetic Fields; D005453:Fluorescence; D006046:Gold / Q000737:chemistry; D007700:Kinetics; D007834:Lasers; D053768:Metal Nanoparticles / Q000737:chemistry*; D056951:Photoelectron Spectroscopy; D012834:Silver / Q000737:chemistry; D013499:Surface Properties
chemical_list: D012834:Silver; D006046:Gold
keywords: Nanoplasmonics; femtosecond laser pulses; field enhancement; photoelectrons; ultrafast interactions