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IEEE Lasers and Electro-Optics Society Annual Meeting (LEOS)

Ultrafast spectroscopy of a two-dimensional electron gas

Michael Woerner, Tina Shih, Chih‐Wei Luo, Klaus Reimann, Thomas Elsaesser, I. Waldmüller, A. Knorr, R. Hey, Klaus Ploog

Published Dec 23, 2004• 0 citations
Publisher

Abstract

Nonlinear transmission measurements of the intersubband resonance on n-type modulation-doped GaAs/AlGaAs multiple quantum wells are presented , which clearly show that for high electron densities radiative coupling becomes the dominant nonlinearity. In contrast, at low electron densities, the quantum wells act almost as uncoupled two-level systems, allowing to observe coherent Rabi oscillations.

DOI
10.1109/leos.2004.1363306

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Nonlinear transmission measurements of the intersubband resonance on n-type modulation-doped GaAs/AlGaAs multiple quantum wells are presented , which clearly show that for high electron densities radiative coupling becomes the dominant nonlinearity. In contrast, at low electron densities, the quantum wells act almost as uncoupled two-level systems, allowing to observe coherent Rabi oscillations.
Radiative coupling of resonantly excited intersubband transitions in GaAs∕AlGaAs\mathrm{Ga}\mathrm{As}∕\mathrm{Al}\mathrm{Ga}\mathrm{As}GaAs∕AlGaAs multiple quantum wells can have a strong impact on the coherent nonlinear optical response, as is shown by phase and amplitude resolved propagation studies of ultrashort electric field transients. Upon increasing the driving field amplitude, strong radiative coupling leads to a pronounced self-induced absorption, followed by a bleaching due to the onset of delayed Rabi oscillations. A many-particle theory including light propagation effects accounts fully for the experimental results.
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