Abstract
Excitonic optical bistability with picosecond switching time in ZnSeCdZnSe multiple quantum wells (MQWs) with a Fabry-Pérot (FP) cavity is investigated at room temperature. The result indicates that the threshold and switching time for the optical bistability in ZnSeCdZnSe MQWs with a FP cavity are about 210 kW/cm2 and 50 ps, respectively. On the basis of the excitonic nonlinear theories, excitonic absorption spectra in the ZnSeCdZnSe MQWs under different excitation intensities obtained here, we attribute the major nonlinear mechanism for the optical bistability in ZnSeCdZnSe MQWs with a FP cavity to the phase space filling of excitonic states and excitonic band broadening due to exciton-exciton interactions.
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