High spatial coherence in multiphoton-photoemitted electron beams
Meier S, Higuchi T, Nutz M, Högele A, Hommelhoff P (2018)
Publication Language: English
Publication Type: Journal article, Letter
Publication year: 2018
Journal
Book Volume: 113
Article Number: 143101
URI: https://arxiv.org/abs/1811.06376
DOI: 10.1063/1.5045282
Abstract
Nanometer-sharp metallic tips are known to be excellent electron emitters. They are used in highest-resolution electron microscopes in cold field emission mode to generate the most coherent electron beam in continuous-wave operation. For time-resolved operation, sharp metal needle tips have recently been triggered with femtosecond laser pulses. We show here that electrons emitted with near-infrared femtosecond laser pulses at laser oscillator repetition rates show the same spatial coherence properties as electrons in cold field emission mode in cw operation. From electron interference fringes, obtained with the help of a carbon nanotube biprism beam splitter, we deduce a virtual source size of less than (0.65 ± 0.06) nm for both operation modes, a factor of ten smaller than the geometrical source size. These results bear promise for ultrafast electron diffraction, ultrafast electron microscopy, and other techniques relying on highly coherent and ultrafast electron beams.
Authors with CRIS profile
Stefan Meier
Lehrstuhl für Laserphysik
Takuya Higuchi
Lehrstuhl für Laserphysik
Peter Hommelhoff
Lehrstuhl für Laserphysik
Involved external institutions
Germany (DE)How to cite
APA:
Meier, S., Higuchi, T., Nutz, M., Högele, A., & Hommelhoff, P. (2018). High spatial coherence in multiphoton-photoemitted electron beams. Applied Physics Letters, 113. https://dx.doi.org/10.1063/1.5045282
MLA:
Meier, Stefan, et al. "High spatial coherence in multiphoton-photoemitted electron beams." Applied Physics Letters 113 (2018).
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