Femtosecond dynamics and non-linearities of exciton-photon coupling in semiconductor microstructures

We have studied the femtosecond dynamics of excitonic resonances in quantum well microcavities under strong excitation. Very strong non-linearities are observed, which bear clear resemblance to the non-linearities of an atomic two-level system. The fact that the excitonic system undergoes Rabi flopping and AC Stark splitting is clearly evidenced in a number of cases. Excitation induced dephasing shows an effect much stronger than the light dressing and prevents the observation of the Rabi flopping only when exciting in the continuum. Most of the experimental findings are well reproduced by a dynamical solution of the Maxwell-Bloch equations for an ensemble of two-level systems. This allows in particular understanding of the occurrence of strong coherent gain in microcavitics. An exhaustive description of the experiments is given within the framework of semiconductor Maxwell-Bloch optical equations at the Hartree-Fock level. (C) 2001 Academie des sciences/Editions scientifiques et medicales Elsevier SAS.


Published in:
Comptes Rendus De L Academie Des Sciences Serie Iv Physique Astrophysique, 2, 10, 1439-1451
Year:
2001
ISSN:
1296-2147
Keywords:
Note:
Ecole Polytech Fed Lausanne, Dept Phys, CH-1015 Lausanne, Switzerland. Deveaud, B, Ecole Polytech Fed Lausanne, Dept Phys, CH-1015 Lausanne, Switzerland.
ISI Document Delivery No.: 523RJ
Times Cited: 0
Cited Reference Count: 52
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