Optimization of off-axis electron holography performed with femtosecond electron pulses.
Cold field emission
Electron holography
Femtosecond laser
Ultrafast transmission electron microscopy
Journal
Ultramicroscopy
ISSN: 1879-2723
Titre abrégé: Ultramicroscopy
Pays: Netherlands
ID NLM: 7513702
Informations de publication
Date de publication:
Jul 2019
Jul 2019
Historique:
received:
17
01
2019
revised:
19
03
2019
accepted:
25
03
2019
pubmed:
2
4
2019
medline:
2
4
2019
entrez:
2
4
2019
Statut:
ppublish
Résumé
We report on electron holography experiments performed with femtosecond electron pulses in an ultrafast coherent Transmission Electron Microscope based on a laser-driven cold field emission gun. We first discuss the experimental requirements related to the long acquisition times imposed by the low emission/probe current available in these instruments. The experimental parameters are first optimized and electron holograms are then acquired in vacuum and on a nano-object showing that useful physical properties can nevertheless be extracted from the hologram phase in pulsed condition. Finally, we show that the acquisition of short exposure time holograms assembled in a stack, combined with a computer-assisted shift compensation of usual instabilities encountered in holography, such as beam and biprism wire instabilities, can yield electron holograms acquired with a much better contrast paving the way to ultrafast time-resolved electron holography.
Identifiants
pubmed: 30933740
pii: S0304-3991(19)30013-0
doi: 10.1016/j.ultramic.2019.03.016
pii:
doi:
Types de publication
Journal Article
Langues
eng
Pagination
26-32Informations de copyright
Copyright © 2019 Elsevier B.V. All rights reserved.