JOURNAL ARTICLE

Thermalization and cooling of plasmon-exciton polaritons: towards quantum condensation

S R K Rodriguez, J Feist, M A Verschuuren, F J Garcia Vidal, J Gómez Rivas
Physical Review Letters 2013 October 18, 111 (16): 166802
24182291
We present indications of thermalization and cooling of quasiparticles, a precursor for quantum condensation, in a plasmonic nanoparticle array. We investigate a periodic array of metallic nanorods covered by a polymer layer doped with an organic dye at room temperature. Surface lattice resonances of the array-hybridized plasmonic-photonic modes-couple strongly to excitons in the dye, and bosonic quasiparticles which we call plasmon-exciton polaritons (PEPs) are formed. By increasing the PEP density through optical pumping, we observe thermalization and cooling of the strongly coupled PEP band in the light emission dispersion diagram. For increased pumping, we observe saturation of the strong coupling and emission in a new weakly coupled band, which again shows signatures of thermalization and cooling.

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