title: Room-temperature polariton lasing in semiconductor microcavities.
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.
authors.affiliation: School of Physics and Astronomy, University of Southampton, Highfield, Southampton, SO17 1BJ, UK.
authors.forename: S
authors.initials: S
authors.lastname: Christopoulos
authors.forename: G Baldassarri Höger
authors.initials: GB
authors.lastname: von Högersthal
authors.forename: A J D
authors.initials: AJ
authors.lastname: Grundy
authors.forename: P G
authors.initials: PG
authors.lastname: Lagoudakis
authors.forename: A V
authors.initials: AV
authors.lastname: Kavokin
authors.forename: J J
authors.initials: JJ
authors.lastname: Baumberg
authors.forename: G
authors.initials: G
authors.lastname: Christmann
authors.forename: R
authors.initials: R
authors.lastname: Butté
authors.forename: E
authors.initials: E
authors.lastname: Feltin
authors.forename: J-F
authors.initials: JF
authors.lastname: Carlin
authors.forename: N
authors.initials: N
authors.lastname: Grandjean