Mainz 2026 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 28: Poster – Quantum Optics
Q 28.31: Poster
Tuesday, March 3, 2026, 17:00–19:00, Philo 2. OG
Guiding electrons in rotating saddle potentials — •Franz Schmidt-Kaler1, Johannes Illmer1, Fabian Bammes1, and Peter Hommelhoff1,2 — 1Department Physik, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91058 Erlangen — 2Fakultät für Physik, Ludwig-Maximilians-Universität, D-80799 München, Germany
We aim at achieving true single particle detection of radiation-sensitive samples by interaction-free measurement (IFM) within a quantum electron microscope (QEM). The principle, already established with photons, can benefit in lateral resolution by switching to electrons. A challenge remains the creation of the required electron-optical elements, namely guide, splitter and resonator. We present a novel guiding concept in which 3D printing enables the creation of rotating saddle potentials. We achieve trap depths of 11eV and show guiding of up to 20keV electrons in simulation and measurement, whilst recording the 1st stability regime. The concept promises simple adoption and could potentially find use in ion trap shuttling, as well as electron optics and localized radiation therapy.
Keywords: matter wave optics; stabiity regimes; auto-ponderomotive pseudo-potentials; electron beam manipulation; interaction-free measurement