Hannover 2013 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 56: Poster III
Q 56.61: Poster
Donnerstag, 21. März 2013, 16:00–18:30, Empore Lichthof
Surface-electrode microwave structures for electron guiding — •Johannes Hoffrogge1, Jakob Hammer1, and Peter Hommelhoff1,2 — 1MPI für Quantenoptik, 85748 Garching — 2Friedrich-Alexander-Universität Erlangen-Nürnberg, 91058 Erlangen
We study the guiding of free electrons in a planar microwave quadrupole guide [1]. The surface-electrode structure is driven at microwave frequencies, which allows tight radial confinement. This results in transverse trap frequencies of up to several hundred MHz and enables the precise control of slow electrons at 1-10 eV by means of purely electric fields. We experimentally and numerically study the dynamics of the electrons and their dependence on the microwave drive parameters. Upon coupling into the guide, the electron trajectories show strong dependence on the microwave phase and fringing electric fields. We therefore present a numerically optimized electrode layout that provides an adiabatic passage of the electron beam into the guide. We also discuss more complex electrode structures like beam splitting elements for guided electrons, as well as designs with electrodes that are larger than the drive wavelength. These require to consider traveling wave effects in the electrode layout [2]. Finally, the combination of an electron guide with a single atom tip electron source should allow the direct preparation of electrons in low-lying quantum states of the transverse harmonic oscillator potential. This would enable new guided matter-wave experiments with electrons.
[1]J. Hoffrogge, et al. Phys. Rev. Lett. 106, 193001 (2011).
[2]J. Hoffrogge, P. Hommelhoff, New. J. Phys 13, 095012 (2011).