Hannover 2013 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 56: Poster III

Q 56.9: Poster

Donnerstag, 21. März 2013, 16:00–18:30, Empore Lichthof

Periodic Potentials for photon gases in dye-filled optical microcavities — •Tobias Damm, David Dung, Julian Schmitt, Cesar Cabrera, Frank Vewinger, Jan Klaers, and Martin Weitz — Institut für Angewandte Physik, Universität Bonn

In earlier works of our group, a thermalized photon gas and a transition to a Bose-Einstein condensate of photons has been realized in a dye-filled optical microcavity. A number-conserving thermalization of the photon gas in this system is achieved by repeated absorption and emission processes of dye-molecules.
Here we report on a method to imprint a spatially periodic or even arbitrary confining potential onto the photon gas. We add a second dye species with very low quantum efficiency whose absorption is spectrally shifted from the observed spectral regime of the condensate. By spatially controlled optical irradiation with a laser beam tuned to the absorption resonance of the "heating" dye, a variable modulation of the refrective index inside the cavity is achieved due to the thermo-optical effect. With this method double-well potentials as well as periodic lattices seem to be possible, and we plan to investigate Josephson oscillation and the Mott Insulator with effectively interacting photon gases in the medium.