Room-temperature polariton lasing in semiconductor microcavities.
Phys Rev Lett
; 98(12): 126405, 2007 Mar 23.
Article
em En
| MEDLINE
| ID: mdl-17501142
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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En
Ano de publicação:
2007
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Article