Ultrafast scanning electron microscope applied for studying the interaction between free electrons and optical near-fields of periodic nanostructures

Beitrag in einer Fachzeitschrift
(Letter)


Details zur Publikation

Autor(en): Kozak M, McNeur J, Schönenberger N, Illmer J, Li A, Tafel A, Yousefi P, Eckstein T, Hommelhoff P
Zeitschrift: Journal of Applied Physics
Jahr der Veröffentlichung: 2018
Band: 124
ISSN: 0021-8979
Sprache: Englisch


Abstract

In this paper, we describe an ultrafast scanning electron microscope
setup developed for the research of inelastic scattering of electrons at
optical near-fields of periodic dielectric nanostructures. Electron
emission from the Schottky cathode is controlled by ultraviolet
femtosecond laser pulses. The electron pulse duration at the interaction
site is characterized via cross-correlation of the electrons with an
infrared laser pulse that excites a synchronous periodic near-field on
the surface of a silicon nanostructure. The lower limit of 410 fs is
found in the regime of a single electron per pulse. The role of pulse
broadening due to Coulomb interaction in multielectron pulses is
investigated. The setup is used to demonstrate an increase in the
interaction distance between the electrons and the optical near-fields
by introducing a pulse-front-tilt to the infrared laser beam.
Furthermore, we show the dependence of the final electron spectra on the
resonance condition between the phase velocity of the optical
near-field and the electron propagation velocity. The resonance is
controlled by adjusting the initial electron energy/velocity and by
introducing a linear chirp to the structure period allowing the increase
of the final electron energy gain up to a demonstrated value of
3.8 keV.


FAU-Autoren / FAU-Herausgeber

Hommelhoff, Peter Prof. Dr.
Yousefi, Peyman
Lehrstuhl für Laserphysik
Illmer, Johannes
Lehrstuhl für Laserphysik
Kozak, Martin
Lehrstuhl für Laserphysik
Li, Ang
Lehrstuhl für Laserphysik
McNeur, Joshua
Lehrstuhl für Laserphysik
Schönenberger, Norbert
Lehrstuhl für Laserphysik
Tafel, Alexander
Lehrstuhl für Laserphysik
Lehrstuhl für Laserphysik


Zitierweisen

APA:
Kozak, M., McNeur, J., Schönenberger, N., Illmer, J., Li, A., Tafel, A.,... Hommelhoff, P. (2018). Ultrafast scanning electron microscope applied for studying the interaction between free electrons and optical near-fields of periodic nanostructures. Journal of Applied Physics, 124. https://dx.doi.org/10.1063/1.5032093

MLA:
Kozak, Martin, et al. "Ultrafast scanning electron microscope applied for studying the interaction between free electrons and optical near-fields of periodic nanostructures." Journal of Applied Physics 124 (2018).

BibTeX: 

Zuletzt aktualisiert 2018-07-12 um 13:53