Semiconductor microcavities containing one or more narrow-linenwidth quantum walls exhibit two transmission peaks when the exciton and cavity are in resonance. It will be shown that the transmission and photoluminescence properties of this system are very sensitive to excitonic optical nonlinearities such as exciton broadening, bandgap renormalization, and state filling. When the cavity mode is detuned to energies above the exciton, at low densities the emission from the lower branch is much larger than that from the upper branch. But as the density is increased the lower emission saturates and the upper emission grows rapidly, lasing at a density less than a factor of two above crossover. It will be shown that this striking crossover is not "boser action" due to a condensation into the upper branch as suggested by [1,2]. Rather it results from the density dependence of the transmission and carrier distribution functions as shown by the good agreement with a fully quantum mechanical microscopic theory for the luminescence from a microcavity.
|Original language||English (US)|
|Number of pages||16|
|Journal||Physica Status Solidi (B) Basic Research|
|State||Published - Mar 1998|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics