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Phys Rev Lett. 2007 Mar 23;98(12):126405. Epub 2007 Mar 21.

Room-temperature polariton lasing in semiconductor microcavities.

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1
School of Physics and Astronomy, University of Southampton, Highfield, Southampton, SO17 1BJ, UK.

Abstract

We observe a room-temperature low-threshold transition to a coherent polariton state in bulk GaN microcavities in the strong-coupling regime. Nonresonant pulsed optical pumping produces rapid thermalization and yields a clear emission threshold of 1 mW, corresponding to an absorbed energy density of 29 microJ cm-2, 1 order of magnitude smaller than the best optically pumped (In,Ga)N quantum-well surface-emitting lasers (VCSELs). Angular and spectrally resolved luminescence show that the polariton emission is beamed in the normal direction with an angular width of +/-5 degrees and spatial size around 5 microm.

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