Vogelsang, Jan and Wittenbecher, Lukas and Mikaelsson, Sara and Guo, Chen and Sytcevich, Ivan and Viotti, Anne-Lise and Arnold, Cord L. and L'Huillier, Anne and Mikkelsen, Anders (2023) Time-resolved photoemission electron microscopy on a ZnO surface using an extreme ultraviolet attosecond pulse pair. Advanced physics research, n/a (230012). pp. 1-9. ISSN 2751-1200

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Abstract

Electrons photoemitted by extreme ultraviolet attosecond pulses derive spatially from the first few atomic surface layers and energetically from the valence band and highest atomic orbitals. As a result, it is possible to probe the emission dynamics from a narrow 2D region in the presence of optical fields, as well as obtain elemental specific information. However, combining this with spatially-resolved imaging is a long-standing challenge because of the large inherent spectral width of attosecond pulses, as well as the difficulty of making them at high repetition rates. Here, it demonstrates an attosecond interferometry experiment on a zinc oxide (ZnO) surface using spatially and energetically resolved photoelectrons. It combines photoemission electron microscopy with near-infrared pump - extreme ultraviolet probe laser spectroscopy and resolve the instantaneous phase of an infrared field with high spatial resolution. The results show how the core level states with low binding energy of ZnO are well suited to perform spatially resolved attosecond interferometry experiments. It observes a distinct phase shift of the attosecond beat signal across the laser focus that it attributes to wavefront differences between the pump and the probe fields at the surface. This work demonstrates a clear pathway for attosecond interferometry with high spatial resolution at atomic scale surface regions opening up for a detailed understanding of nanometric light-matter interaction.

Item Type:	Article
Additional Information:	_eprint: https://onlinelibrary.wiley.com/doi/pdf/10.1002/apxr.202300122
Uncontrolled Keywords:	attosecond interferometry, surface science, time-resolved photoemission electron microscopy, zinc oxide
Subjects:	Science and mathematics > Physics
Divisions:	Faculty of Mathematics and Science > Institute of Physics (IfP)
Date Deposited:	09 Jan 2024 13:14
Last Modified:	09 Jan 2024 13:14
URI:	https://oops.uni-oldenburg.de/id/eprint/5983
URN:	urn:nbn:de:gbv:715-oops-60647
DOI:	10.1002/apxr.202300122
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