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II7.04 - Polariton Interactions in an Organic Polariton Condensate 
April 23, 2014   4:30pm - 5:00pm

The last decade has seen a flourishing field devoted to the study of the quantum fluidic behaviour of light. One branch of this field has focused on exploiting the properties of cavity polaritons: hybrid light-matter quasiparticles formed in semiconductor microcavities. These demonstrations have, for the most part, been limited to inorganic semiconductors and cryogenic temperatures. The large exciton binding energy characteristic of organic Frenkel excitons, however, make these an attractive candidate for the realisation of room-temperature quantum fluids.In this talk, we will review the physics of exciton-polaritons and previous demonstrations of polariton lasing using organic semiconductors. We will then describe a room-temperature organic polariton condensate using a novel oligofluorene enclosed within an optical microcavity. In contrast to previous demonstrations of organic polariton lasing, we find that interactions between polaritons in this material system lead to a power-dependent blueshift of the condensate energy above the condensation threshold. We will show how these interactions allow the rich physics of the Gross-Pitaevskii equation to be studied at room temperature. In particular, we will explicitly demonstrate the onset of macroscopic spatial coherence beyond the condensation threshold and the presence of pinned vortices.

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Fred Kavli Distinguished Lectureship in Nanoscience
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