ULTRAFAST DYNAMICS AND PARAMETRIC EXCITATIONS OF MICROCAVITY MODES

Dynamics of semiconductor microcavity modes in ZnSe-metal structure wa s investigated by femtosecond pump-supercontinuum probe spectroscopy i n the wide spectral region 300-800 nm. The change of reflectivity and transmissivity of the structure ZnSe(285 nm)/Cu (22 nm)/quartz was mon itored. The powerful laser pump pulse excites electrons of metal (i.e. , boundary of the microcavity) and of the ZnSe layer (mainly by two-ph oton absorption). Nonequilibrium carriers of metal penetrate through t he Schottky electron barrier into the semiconductor. These processes l ead to the change of dielectric functions of Cu and ZnSe and to a chan ge of frequencies of cavity modes.