Quantum size effect and pronounced optical nonlinearities in porous silicon
Dneprovskii V. S. , Karavanskii V. A. , Klimov V. I., Maslov A. P.
Bleaching bands have been observed in the time-resolved nonlinear transmission spectra of porous silicon. They are attributed to a saturation of optical transitions between quantum-size levels in a system of spatially localized carriers.