8 February 2015 Exciton-polariton Bose-Einstein condensation with a polymer at room temperature
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We create exciton-polariton quasi-particles by exciting optically a microcavity filled with a ladder-type conjugated polymer in the strong coupling regime. At room temperature thermalization of these quasi-particles occurs while it is suppressed at low temperature due to a relaxation bottleneck. Above a certain excitation threshold with incoherent offresonant picosecond laser pulses, we observe the emergence of non-equilibrium Bose-Einstein condensation in the lower polariton branch. This is evidenced by several distinct features such as a blue-shifted emission peak at zero in-plane momentum, accompanied by a nonlinear increase in the emission intensity and a sudden drop of the line width. In contrast to conventional lasing, we find a strong increase in threshold when decreasing the temperature, which can be explained by the peculiar thermalization properties. Single-shot measurements of the emission spectrum allow studying single realizations of the condensate, giving access to non-averaged properties from each individual condensation process. Our approach demonstrates a radically simplified route to investigate Bose-Einstein condensation physics at ambient conditions with easy-to-process non-crystalline materials.
© (2015) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Thilo Stöferle, Thilo Stöferle, Johannes D. Plumhof, Johannes D. Plumhof, Lijian Mai, Lijian Mai, Ullrich Scherf, Ullrich Scherf, Rainer F. Mahrt, Rainer F. Mahrt, "Exciton-polariton Bose-Einstein condensation with a polymer at room temperature", Proc. SPIE 9370, Quantum Sensing and Nanophotonic Devices XII, 93702T (8 February 2015); doi: 10.1117/12.2083831; https://doi.org/10.1117/12.2083831


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