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Q: Quantenoptik und Photonik

Q 31: Poster Fallen und Kühlung

Q 31.2: Poster

Dienstag, 14. März 2006, 16:30–18:30, Labsaal

An ultracold chromium atomic beam for nanofabrication — •Alexander Greiner, Jimmy Sebastian, Inam Mirza, Paul Rehme, Jürgen Stuhler, and Tilman Pfau — Universität Stuttgart, 5. Physikalisches Institut, Pfaffenwaldring 57, 70550 Stuttgart

Chromium nanostructures have been produced by several groups using atom lithography techniques. These experiments exclusively used a thermal chromium beam which leads to a limitation of the achievable structure widths due to chromatic, spherical and Clebsch-Gordan aberrations. Our setup will use a monochromatic ultracold atomic beam for atomic lithography which leads to a strong suppression of the chromatic aberration. In addition, the Clebsch-Gordan aberration is strongly reduced because in our beam, the atoms are optically pumped and magnetically guided in the extreme Zeeman substate. The spherical aberration due to the anharmonicity of the light mask shall be reduced by using multilayer masks in order to minimize the achievable structure widths [1].

The atomic beam is created in a "moving molasses" MOT and is guided via 1.5m long Ioffe bars to the place of deposition. We report on the progress of our experiment.

[1] R. Arun et al, Physical Review A 72, 023417 (2005)