Room-temperature polariton lasing in semiconductor microcavities |
| |
| Authors: | Christopoulos S von Högersthal G Baldassarri Höger Grundy A J D Lagoudakis P G Kavokin A V Baumberg J J Christmann G Butté R Feltin E Carlin J-F Grandjean N |
| |
| Affiliation: | 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. |
| |
| Keywords: | |
| 本文献已被 PubMed 等数据库收录！ |
|
