Cooperative scattering from (dis-)ordered ultracold strontium clouds

We are currently setting up an experiment to cool and Bose-condense strontium atomic gases. Our goal is to study the cooperative scattering of light by disordered and periodically ordered atomic clouds and quantum matter organized in three-dimensional optical lattices. Particular attention will be given to the observation of Mie resonances and forbidden photonic bands.

Gravitational quantum sensing with atoms in optical ring cavities

Atomic gravimeters based on matter wave interference are among the most accurate gravity sensors. A technique which is particularly appealing by its conceptual simplicity detects Bloch oscillations of atoms falling through a vertical standing light wave. We started realizing such a gravimeter with Bose-condensed strontium with the additional highlight of in vivo monitoring the oscillatory matter wave trajectory.

Atoms interacting with plasmons

The goal of this research line is to investigate, how cold atoms interacting with evanescent surface waves may be exploited for miniaturized quantum sensors. Such evanescent waves can be generated by exciting surface plasmon polaritons in specifically designed nano-structures, and it is even possible to design optical nanopotentials capable of trapping atoms near surfaces.

Theory of cooperative scattering

A microscopic description of cooperative scattering of light at an atomic ensemble leads to a deeped insight into macroscopic phenomena, such as radiation pressure reduction due to superradiantly enhanced forward scattering, Mie resonances in ultracold atomic clouds, sub-radiance, Anderson localization of light, and photonic bands in periodically structured optical lattices.