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 29μJcm-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° and spatial size around 5μm.
- Publication:
-
Physical Review Letters
- Pub Date:
- March 2007
- DOI:
- Bibcode:
- 2007PhRvL..98l6405C
- Keywords:
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- 71.36.+c;
- 03.75.Kk;
- 73.21.-b;
- 81.07.-b;
- Polaritons;
- Dynamic properties of condensates;
- collective and hydrodynamic excitations superfluid flow;
- Electron states and collective excitations in multilayers quantum wells mesoscopic and nanoscale systems;
- Nanoscale materials and structures: fabrication and characterization