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Q: Fachverband Quantenoptik und Photonik

Q 50: Poster Ultrakalte Atome

Q 50.1: Poster

Donnerstag, 13. März 2008, 16:30–19:00, Poster C2

Trapping and guiding neutral atoms using ultra-thin optical fibres. — •Guillem Sagué, Eugen Vetsch, Florian Warken, and Arno Rauschenbeutel — Institut für Physik, Staudingerweg 7, 55128 Mainz

We aim to optically trap and guide neutral atoms close to the surface of subwavelength-diameter optical fibres. For this purpose, we set up a two-colour surface trap which is based on light-induced dipole forces exerted on the atoms by a blue- and red-detuned evanescent light field [1], created by launching two co-propagating laser beams through the fibre. This results in a cylindrically symmetric trap around the fibre. It exhibits a trapping minimum about two hundred nanometers above the surface with expected radial trapping frequencies above 700 kHz. By launching a second, counter-propagating red-detuned laser beam through the fibre a red-detuned standing wave can be realized. This results in a periodic trapping potential along the fibre, thereby confining the atoms in all three dimensions.

[1] G. Sagué, E. Vetsch, W. Alt, D. Meschede, and A. Rauschenbeutel, Phys. Rev. Lett. 99, 163602 (2007)