SAMOP 2023 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 7: Poster I

Q 7.7: Poster

Montag, 6. März 2023, 16:30–19:00, Empore Lichthof

Design and construction of a multi-hit-capable electron spectrometer for ultrafast photoemission experiments — •Jonathan Pölloth, Jonas Heimerl, and Peter Hommelhoff — Department Physik, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91058 Erlangen.

The investigation of electron photoemission from metallic needle tips by femtosecond laser pulses allows to gain insights into ultrafast light-matter interaction processes. An important observable is the energy spectrum of the emitted electrons. Two typical features of such strong field spectra are the multiphoton peaks and the plateau due to rescattering. So far, mostly one-electron spectra have been considered, only recently first experiments on multi-electron emission were realised [1,2]. The energy-resolved simultaneous detection of more than one electron from one laser pulse is challenging. Here, we demonstrate a multi-hit-capable electron spectrometer for measuring electron energy spectra emitted from a tungsten needle tip. We use an electrostatic cylindrical deflector analyser that provides spatial separation of different electron energies. The spectrometer is designed and optimized using a commercial finite element solver. Our simulations show that an energy resolution below 0.25 eV at a central electron energy of 100 eV is feasible. This resolution not only allows us to observe strong field effects in the spectrum, but also to distinguish between different multiphoton order peaks.

[1] S. Meier, J. Heimerl and P. Hommelhoff, arXiv:2209.11806 (2022)

[2] R. Haindl et al., arXiv:2209.12300, (2022)