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


Book Volume: 113

Article Number: 143101

URI: https://arxiv.org/abs/1811.06376

DOI: 10.1063/1.5045282


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.

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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


Meier, Stefan, et al. "High spatial coherence in multiphoton-photoemitted electron beams." Applied Physics Letters 113 (2018).

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