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 G\"ottingen 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 9 {\AA} focused beam diameter, 200 fs pulse duration and 0.6 eV 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.
Keywords
Cite
@article{arxiv.1611.05022,
title = {Ultrafast transmission electron microscopy using a laser-driven field emitter: femtosecond resolution with a high coherence electron beam},
author = {Armin Feist and Nora Bach and Nara Rubiano da Silva and Thomas Danz and Marcel Möller and Katharina E. Priebe and Till Domröse and J. Gregor Gatzmann and Stefan Rost and Jakob Schauss and Stefanie Strauch and Reiner Bormann and Murat Sivis and Sascha Schäfer and Claus Ropers},
journal= {arXiv preprint arXiv:1611.05022},
year = {2017}
}