title: Spatiotemporal control of nanooptical excitations.
abstract: The most general investigation and exploitation of light-induced processes require simultaneous control over spatial and temporal properties of the electromagnetic field on a femtosecond time and nanometer length scale. Based on the combination of polarization pulse shaping and time-resolved two-photon photoemission electron microscopy, we demonstrate such control over nanoscale spatial and ultrafast temporal degrees of freedom of an electromagnetic excitation in the vicinity of a nanostructure. The time-resolved cross-correlation measurement of the local photoemission yield reveals the switching of the nanolocalized optical near-field distribution with a lateral resolution well below the diffraction limit and a temporal resolution on the femtosecond time scale. In addition, successful adaptive spatiotemporal control demonstrates the flexibility of the method. This flexible simultaneous control of temporal and spatial properties of nanophotonic excitations opens new possibilities to tailor and optimize the light-matter interaction in spectroscopic methods as well as in nanophotonic applications.
authors.affiliation: Fachbereich Physik and Research Center OPTIMAS, Technische Universität Kaiserslautern, Erwin-Schrödinger-Strasse 46, 67663 Kaiserslautern, Germany.
authors.forename: Martin
authors.initials: M
authors.lastname: Aeschlimann
authors.forename: Michael
authors.initials: M
authors.lastname: Bauer
authors.forename: Daniela
authors.initials: D
authors.lastname: Bayer
authors.forename: Tobias
authors.initials: T
authors.lastname: Brixner
authors.forename: Stefan
authors.initials: S
authors.lastname: Cunovic
authors.forename: Frank
authors.initials: F
authors.lastname: Dimler
authors.forename: Alexander
authors.initials: A
authors.lastname: Fischer
authors.forename: Walter
authors.initials: W
authors.lastname: Pfeiffer
authors.forename: Martin
authors.initials: M
authors.lastname: Rohmer
authors.forename: Christian
authors.initials: C
authors.lastname: Schneider
authors.forename: Felix
authors.initials: F
authors.lastname: Steeb
authors.forename: Christian
authors.initials: C
authors.lastname: Strüber
authors.forename: Dmitri V
authors.initials: DV
authors.lastname: Voronine