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Ultrafast polariton population build-up mediated by molecular phonons in organic microcavities
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16. E. Bittner
, S. Zaster
, C. Silva
, e-print arXiv:1103.1326v1
, Dynamics of a polariton condensate in a Organic Semiconductor Microcavity (2011
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A key prerequisite for low-threshold polariton lasing in organic or inorganic microcavity systems is the efficient population of the lower polariton ground state. Here, we report the observation of a resonant phonon-mediated relaxation process which gives rise to nonthermal polariton population with sub 100 fs build-up times. This mechanism is manifested by discrete maxima of the angular-resolved photoluminescence intensity, with corresponding shortening of the photoluminescence rise time at respective phononresonances. The realization of enhanced relaxation rates in disordered J-aggregate systems is important for developing room temperature organic laser sources with less fabrication complexity than their crystalline counterparts.
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