Due to the large mismatch in the refractive index of semiconductor material and air, time-integrated and spectrally resolved four-wave mixing experiments reveal strong influence of the cladding layer thickness, its refractive index, and the reflectivity of the sample-air interface on the radiative dephasing time of excitons in single quantum wells and multiple quantum well structures. A cladding layer thickness of λ/2 and λ/4 enhances and decreases, respectively, the radiative contribution to the exciton linewidth and causes radiative shifts to higher and lower energies, respectively. All our experiments are well described by solutions of the semiconductor Maxwell-Bloch equations.
|Original language||English (US)|
|Number of pages||5|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|State||Published - Jan 1 2000|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics