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Article Dans Une Revue Revue de Physique Appliquée Année : 1987

Subpicosecond excitonic optical nonlinearities in quantum wells

M. Joffre
D. Hulin
  • Fonction : Auteur
A. Migus
  • Fonction : Auteur
A. Mysyrowicz
A. Antonetti
  • Fonction : Auteur

Résumé

Excitonic resonances in semiconductors are very sensitive to applied optical fields. We present here a comparison between the effects of resonant and non resonant optical excitation, creating respectively real or virtual excitons. A blue shift of the exciton line and a reduction of the oscillator strength are simultaneously observed in multiple-quantum-well-structures for the two following cases : presence of a population of real excitons in very thin wells (two-dimensional systems), or presence of an intense offresonance non absorbed optical field (virtual excitons) independently of the well thickness. The latter configuration (optical Stark effect) has been studied as a function of pump intensity, determining in particular how the saturation of the blue shift is related to the exciton bleaching.
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Dates et versions

jpa-00245730 , version 1 (04-02-2008)

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M. Joffre, D. Hulin, A. Migus, A. Mysyrowicz, A. Antonetti. Subpicosecond excitonic optical nonlinearities in quantum wells. Revue de Physique Appliquée, 1987, 22 (12), pp.1705-1709. ⟨10.1051/rphysap:0198700220120170500⟩. ⟨jpa-00245730⟩

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