title: Energy distribution curves of ultrafast laser-induced field emission and their implications for electron dynamics.
abstract: Energy distribution curves of laser-induced electron pulses from a tungsten tip have been measured as a function of tip voltage and laser power. Electron emission via tunneling through and/or excitation over the surface barrier from photoexcited nonequilibrium electron distributions are clearly observed. The spectral shapes largely vary with the emission processes and are strongly affected by electron dynamics. Simulations successfully reproduce the spectra, thus allowing direct insight into the involved electron dynamics and revealing the temporal tunability of electron emission via the two experimental parameters. These results should be useful to optimize the pulse characteristics for many applications based on ultrafast laser-induced electron emission.
authors.affiliation: Physik Institut, Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland. hirofumi@phys.ethz.ch
authors.forename: Hirofumi
authors.initials: H
authors.lastname: Yanagisawa
authors.forename: Matthias
authors.initials: M
authors.lastname: Hengsberger
authors.forename: Dominik
authors.initials: D
authors.lastname: Leuenberger
authors.forename: Martin
authors.initials: M
authors.lastname: Klöckner
authors.forename: Christian
authors.initials: C
authors.lastname: Hafner
authors.forename: Thomas
authors.initials: T
authors.lastname: Greber
authors.forename: Jürg
authors.initials: J
authors.lastname: Osterwalder