BIEXCITONIC EFFECTS IN THE NONPERTURBATIVE REGIME OF SEMICONDUCTOR MICROCAVITIES

Polarization-dependent transient pump-probe spectroscopy reveals impor tant effects of biexcitonic interactions on coupled optical excitation s in semiconductor microcavities. We show that exciton-to-biexciton tr ansitions can result in a significant increase in normal mode splittin g of cavity-polaritons, in sharp contrast to effects of nonlinear opti cal interactions such as band filling that reduce the splitting. A phe nomenological model based on Maxwell-Bloch equations is developed to e lucidate how biexcitonic effects contribute to cavity-polaritons. [S01 63-1829(98)50120-8].