Polaritons in Semiconducting Organic Films

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Polaritons are quasiparticles formed by entanglement of a photon with an excitation of a molecule or atom. Recent experimental work on inorganic microcavities has shown that these quasiparticles can undergo a phase transition to form a Bose–Einstein condensate with a transition temperature approaching room temperature. This Demonstration computes the polariton dispersion curve for a layer of anthracene sandwiched between two reflecting mirrors. The cavity gap, , determines the cutoff frequency for a photon in the cavity and is the photon wavevector parallel to the mirrors. Computed are the effective mass of a lower polariton and the nonlinearity parameter for the Gross–Pitaevskii equation describing a polariton condensate state.

Contributed by: Eric R. Bittner (April 2011)
Open content licensed under CC BY-NC-SA



This Demonstration is based upon work sponsored by the National Science Foundation (CHE-1011894).


[1] D. G. Lidzey, D. D. C. Bradley, M. S. Skolnick, T. Virgili, S. Walker, and D. M. Whittaker. "Strong Exciton-Photon Coupling in an Organic Semiconductor Microcavity," Nature, 395, 1998 pp. 53–55.

[2] J. Kasprzak, M. Richard, S. Kundermann, A. Baas, P. Jeambriun, J. M. J. Keeling, F. M. Marchetti, M. H. Szymanska, R. André, J. L. Staehli, V. Savona, P. B. Littlewood, B. Deveaud, and L. S. Dang. "Bose–Einstein Condensation of Exciton Polaritons," Nature, 443, 2006 pp. 409–414.

[3] P. B. Littlewood, J. M. J. Keeling, B. D. Simons, P. R. Eastham, F. M. Marchetti, and M. H. Szyman╠üska. "Novel Quantum Condensates in Excitonic Matter," in Lectures on the Physics of Strongly Correlated Systems (A. Avella and F. Mancini, Eds.), Vol. 1162, AIP, 2009 pp. 15–54.

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