@article { , title = {Ultrafast polariton relaxation dynamics in an organic semiconductor microcavity}, abstract = {We study an organic semiconductor microcavity operating in the strong-coupling regime using fs pump-probe spectroscopy. By probing the induced absorption associated with the one-exciton to two-exciton transition, we are able to characterize the time-dependent population densities of states in the upper-and lower-polariton branches following impulsive excitation. We model the time-dependent polariton dynamics and provide direct evidence of a scattering process that returns upper-branch cavity polaritons to states in the exciton reservoir having a rate of (150 fs)(-1). A slower process similarly populates lower-branch polaritons by return scattering from the exciton reservoir.}, doi = {10.1103/PhysRevB.83.245309}, eissn = {1550-235X}, issn = {1098-0121}, issue = {24}, journal = {PHYSICAL REVIEW B}, note = {Batch 004. Output ID 28800. Please upload a pdf copy of the full paper and indicate if the research is Interdisciplinary. Thanks Katy}, pages = {245309}, publicationstatus = {Published}, publisher = {American Physical Society}, url = {https://hull-repository.worktribe.com/output/400144}, volume = {83}, keyword = {Specialist Research - Other, Electronic, Optical and Magnetic Materials, Condensed Matter Physics}, year = {2011}, author = {Virgili, T. and Coles, D. and Adawi, A. M. and Clark, C. and Michetti, P. and Rajendran, S. K. and Brida, D. and Polli, D. and Cerullo, G. and Lidzey, D. G.} }