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Q: Fachverband Quantenoptik und Photonik

Q 30: Poster II

Q 30.22: Poster

Dienstag, 3. März 2009, 16:30–19:00, VMP 9 Poster

High resolution imaging of an ultracold quantum gas — •Tatjana Gericke, Peter Würtz, Andreas Koglbauer, and Herwig Ott — Institut für Physik, Johannes Gutenberg-Universität, 55099 Mainz

We describe a new detection and manipulation technique based on scanning electron microscopy which allows for the detection of single atoms in a quantum gas with a spatial resolution of better than 150 nm. A focussed electron beam with a FWHM of 100 nm is moved over the atom cloud and ionizes atoms by electron impact ionization. The produced atoms are subsequently extracted with the aid of ion optics and detected.

We produce a ⁸⁷Rb condensate in a single beam optical dipole trap formed by a focussed CO₂ laser beam. We have implemented a two-dimensional with 600 nm lattice spacing to study quantum gases in periodic potentials. Our imaging technique enables us not only to resolve single lattice sites but also to remove atoms from selected sites without affecting neighboring sites. Therefor our technique offers a versatile experimental platform for the in situ study of ultracold quantum gases in various trapping geometries.