Nonlinear intersubband optical response of multiple-quantum-well structures

We present a theoretical formalism, based on the transfer matrix method and the so-called sheet model, which describes light propagation in multiple-quantum-well (MQW) structures in the range of nonlinear intersubband absorption. Intensity of the transmited light as a function of the input intensity is calculated for typical GaAs/GaAlAs MQW. A comparison with commonly used in literature slowly varying envelope approximation is also given.