title: Ultrafast transmission electron microscopy using a laser-driven field emitter: Femtosecond resolution with a high coherence electron beam.
abstract: We present the development of the first ultrafast transmission electron microscope (UTEM) driven by localized photoemission from a field emitter cathode. We describe the implementation of the instrument, the photoemitter concept and the quantitative electron beam parameters achieved. Establishing a new source for ultrafast TEM, the Göttingen UTEM employs nano-localized linear photoemission from a Schottky emitter, which enables operation with freely tunable temporal structure, from continuous wave to femtosecond pulsed mode. Using this emission mechanism, we achieve record pulse properties in ultrafast electron microscopy of 9Å focused beam diameter, 200fs pulse duration and 0.6eV energy width. We illustrate the possibility to conduct ultrafast imaging, diffraction, holography and spectroscopy with this instrument and also discuss opportunities to harness quantum coherent interactions between intense laser fields and free-electron beams.
authors.affiliation: 4th Physical Institute - Solids and Nanostructures, University of Göttingen, Göttingen, Germany.
authors.forename: Armin
authors.initials: A
authors.lastname: Feist
authors.affiliation: 4th Physical Institute - Solids and Nanostructures, University of Göttingen, Göttingen, Germany.
authors.forename: Nora
authors.initials: N
authors.lastname: Bach
authors.affiliation: 4th Physical Institute - Solids and Nanostructures, University of Göttingen, Göttingen, Germany.
authors.forename: Nara
authors.initials: N
authors.lastname: Rubiano da Silva
authors.affiliation: 4th Physical Institute - Solids and Nanostructures, University of Göttingen, Göttingen, Germany.
authors.forename: Thomas
authors.initials: T
authors.lastname: Danz
authors.affiliation: 4th Physical Institute - Solids and Nanostructures, University of Göttingen, Göttingen, Germany.
authors.forename: Marcel
authors.initials: M
authors.lastname: Möller
authors.affiliation: 4th Physical Institute - Solids and Nanostructures, University of Göttingen, Göttingen, Germany.
authors.forename: Katharina E
authors.initials: KE
authors.lastname: Priebe
authors.affiliation: 4th Physical Institute - Solids and Nanostructures, University of Göttingen, Göttingen, Germany.
authors.forename: Till
authors.initials: T
authors.lastname: Domröse
authors.affiliation: 4th Physical Institute - Solids and Nanostructures, University of Göttingen, Göttingen, Germany.
authors.forename: J Gregor
authors.initials: JG
authors.lastname: Gatzmann
authors.affiliation: 4th Physical Institute - Solids and Nanostructures, University of Göttingen, Göttingen, Germany.
authors.forename: Stefan
authors.initials: S
authors.lastname: Rost
authors.affiliation: 4th Physical Institute - Solids and Nanostructures, University of Göttingen, Göttingen, Germany.
authors.forename: Jakob
authors.initials: J
authors.lastname: Schauss
authors.affiliation: 4th Physical Institute - Solids and Nanostructures, University of Göttingen, Göttingen, Germany.
authors.forename: Stefanie
authors.initials: S
authors.lastname: Strauch
authors.affiliation: 4th Physical Institute - Solids and Nanostructures, University of Göttingen, Göttingen, Germany.
authors.forename: Reiner
authors.initials: R
authors.lastname: Bormann
authors.affiliation: 4th Physical Institute - Solids and Nanostructures, University of Göttingen, Göttingen, Germany.
authors.forename: Murat
authors.initials: M
authors.lastname: Sivis
authors.affiliation: 4th Physical Institute - Solids and Nanostructures, University of Göttingen, Göttingen, Germany. Electronic address: sascha.schaefer@phys.uni-goettingen.de.
authors.forename: Sascha
authors.initials: S
authors.lastname: Schäfer
authors.affiliation: 4th Physical Institute - Solids and Nanostructures, University of Göttingen, Göttingen, Germany. Electronic address: claus.ropers@uni-goettingen.de.
authors.forename: Claus
authors.initials: C
authors.lastname: Ropers
keywords: Coherent ultrashort electron pulses; Nanoscale photoemitters; Nanoscale structural dynamics; Ultrafast dynamics; Ultrafast transmission electron microscopy (UTEM)