Electroabsorption and electrorefraction in GaAs/AlGaAs waveguides containing asymmetric coupled quantum wells

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Abstract
Changes in the optical phase and transmission with applied electric fields were measured in GaAs/AlGaAs waveguides containing asymmetric coupled quantum wells. At sufficiently high applied bias, the lowest energy optical transition supported by this system is that between the lowest energy hole subband of the wide well and the lowest energy electron subband of the narrow well. We show that this interwell transition produces significant contributions to both the electroabsorption and the electrorefraction in the coupled quantum well system.