Freiburg 2024 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 21: Interaction with Strong or Short Laser Pulses II (joint session A/MO)

A 21.4: Vortrag

Mittwoch, 13. März 2024, 15:15–15:30, HS 1010

Strong-field Electron Emission of metal Nanotips with optical Single-Cycle Pulses — •Anne Herzig, Lennart Seiffert, and Thomas Fennel — University of Rostock, Institute of physics, Albert-Einstein-Straße 23, 18059 Rostock

Exposing nanostructures to strong fields enables the emission of energetic electrons via near-field driven elastic backscattering [1]. The availability of intense single cycle or sub-single cycle waveforms [2, 3] enables to explore the formation and propagation of attosecond electron pulses in previously inaccessible regimes of the strong-field interaction. Recent experimental studies [4] have shown promising results on analyzing the short backscattering electron signal. In this talk, the electron emission from tungsten nanotips under intense single-cycle pulses is inspected theoretically via one-dimensional single-active TDSE simulations. The calculated carrier-envelope phase-dependent photoelectron energy spectra reveal prominent signatures with pronounced differences to previous studies performed with many-cycle pulses [5]. The physical origins behind the observed spectral features are disentangled by extending the famous Simple Man’s Model of strong-field physics.

[1] M. F. Ciappina et al., Rep. Prog. Phys. 80, 054401 (2017)

[2] A. Wirth et al., Science 334, 195 (2011)

[3] M. T. Hassan et al., Nature 530, 66 (2016)

[4] H. Y. Kim et al., Nature 613, 7945 (2023)

[5] L. Seiffert et al., J. Phys. B 51, 134001 (2018)

Keywords: strong-field ionization; single-cycle pulses; nanotips