Abstract
We discuss, theoretically, employing formalism based on the transfer matrix method and the so-called sheet model, the linear and nonlinear (saturated) optical phase shifts associated with intersubband transitions in multiple quantum well (MQW) structures. A commonly used total internal reflection geometry is considered. Numerical simulations are performed for two-level GaAs∕AlxGa1−xAs MQWs. They show that the above-mentioned phase shift can be greatly modified by optical interference effects and radiative coupling between QWs particularly at the grazing angle of incidence. For the restricted range of parameters even the bistable behavior of the nonlinear phase shift and reflectivity are possible.
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