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Q: Fachverband Quantenoptik und Photonik

Q 1: Quantengase: Bosonen 1

Q 1.7: Vortrag

Montag, 12. März 2012, 12:00–12:15, V53.01

Thermalization of a two-dimensional photon gas in a polymeric host matrix — •Julian Schmitt, Jan Klärs, Tobias Damm, David Dung, Frank Vewinger, and Martin Weitz — Institut für Angewandte Physik, Universität Bonn, Wegelerstraße 8, D-53115 Bonn

We investigate thermodynamic properties of a two-dimensional photon gas confined by a polymer-filled optical microcavity. A thermally equilibrated state of the photon gas is achieved by radiative coupling of the photons to a heat bath, that is composed of dye molecules at room temperature. Differently from previous measurements with liquid dye solutions, the presented experimental scheme incorporates dye molecules implemented in polymeric host matrices. Prior examinations of thermalized bosons in solid state systems gave rise to reports on intriguing effects, such as the formation of quasi-condensates of exciton-polaritons. In contrast to this, the here discussed experiments are carried out far below the strong-coupling regime in a system with large decoherence. In a proof-of-principle experiment a thermalization of photons in the applied polymer substance is observed. Furthermore, we report on fluorescence characteristics of dye molecules embedded in polymers, and discuss the applicability of a Kennard-Stepanov theory in this context. The described solid state scheme demonstrates a first step towards technical applications. In the future, dye-based solid state systems hold promise for the realization of single-mode light sources in thermal equilibrium, as well as the solar energy concentrators.