Ultra-fast polariton dynamics in an organic microcavity
1 IFN, CNR Dipartimento di Fisica, Politecnico di Milano, P.zza Leonardo Da Vinci 32, 20132 Milano, Italy
2 Department of Physics and Astronomy, University of Sheffield, Hicks Building, Hounsfield Road, Sheffield S3 7RH, United Kingdom
3 Helia Photonics Ltd. Rosebank Park, Livingston, West Lothian EH54 7EJ, United Kingdom
4 Institute of Theoretical Physics and Astrophysics, University of Würzburg, D-97074 Würzburg, Germany
We study an organic semiconductor microcavity operating in the strong-coupling regime using femtosecond pump-probe spectroscopy. By probing the photo-induced absorption bands, we characterize the time-dependent population densities of states in the two polariton branches. We found evidence of a scattering process from the upper-branch cavity polaritons to the exciton reservoir having a rate of (150 fs)-1. A slower process similarly populates lower-branch polaritons with a rate of around (3ps)-1
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