Hannover 2010 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 55: Poster II

Q 55.22: Poster

Donnerstag, 11. März 2010, 16:00–19:00, Lichthof

Microwave structures for electron guiding — •Johannes Hoffrogge and Peter Hommelhoff — Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Straße 1, 85748 Garching bei München

We present microwave structures for the guiding of electrons in an alternating quadrupole field. These combine the electrode layout of a two dimensional planar Paul trap with that of a microwave transmission line. For longitudinal guide dimensions comparable to the wavelength of the driving field, the microwave guiding properties of these structures have to be considered. A normal mode decomposition of the trapping field shows that the latter consists of a superposition of two different eigenmodes of the electrode structure with differing propagation constants. For a typical structure driven at 10 GHz this leads to a dephasing by 5^∘ after a propagation length of 7 cm. We investigate the consequences of this on the particle dynamics by numerical particle tracking and discuss strategies to minimize the effect.

At the moment, we are setting up a proof of principle experiment, where we will guide electrons in an electrically small structure at 1 GHz. Besides microwave measurements on test substrates, we present the characteristics of a low energy electron source and the current status of the experiment.