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Mixing/Resonance of Electronic States and Optical Nonlinearity in a GaAs/AlGaAs Asymmetric Triple Quantum Well Structure

The input power dependence on the transmission of a light through a GaAs/AlGaAs asymmetric triple quantum well (ATQW) shows strong nonlinearity at 77 K, the behavior of which depends on the wavelength of the input light. By studying the relation of nonlinearity to the photoluminescence spectra, the resulting phenomenon is attributed to the Stark shift and change of the optical oscillator strength which is due to the triple resonance of the electronic states. The triple resonance is induced by the temporal separation of photo-excited electrons and holes.