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The mechanism of the nonlinear photo-carrier generation in low-temperature-grown GaAs by 1.5 μm pulses was investigated by a double pulse experiment. The effect of intermediate excitation on the photo response was distinctly observed. Moreover, the effect was found to be largely coherent, contrary to the proposed model.
Optical nonlinear effects are examined using a two-color micro-photoluminescence method in a coherently-coupled exciton-biexciton system in a single quantum dot. The exciton nonlinear absorption spectrum shows an unusual asymmetric shape induced by Fano interference effects.
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