Diffusive Propagation of Exciton-Polaritons through Thin Crystal Slabs

Original · EN

Comparative studies of the resonant transmission of light in the vicinity of exciton resonances, measured for 15 few-micron GaAs crystal slabs with different impurity concentrations N, reveal an unexpected tendency. While N spans almost five decimal orders of magnitude, the normalized spectrally-integrated absorption of light scales with the impurity concentration as N¹/⁶. We show analytically that this dependence is a signature of the diffusive mechanism of propagation of exciton-polaritons in the semiconductor.