Free-carrier absorption in asymmetric double quantum well structures due to static scatterers in the in-plane polarization

We report on the computation of the free-carrier absorption induced by static scatterers in asymmetric double quantum well structures when the electromagnetic wave propagates along the growth axis. We find that a Drude-like tail exists for this polarization. The absorption is found to be larger than when the wave propagates in the layer plane. Also, intrasubband scattering is found to be more efficient than intersubband scattering. The alloy scattering is found to be particularly efficient.