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We present a Maxwell-Bloch description of the dynamics of a light pulsepropagating through a spatially inhomogeneous system consisting of alternatinglayers of EIT media and vacuum. We study the effect of a dynamical modulationof the EIT control field on the shape of the wave packet: interesting effectsdue to the presence of interfaces with group velocity mismatch are found. Aneffective description based on a continuity equation is developed. Modulationschemes that can be realized in ultracold atomic samples with standardexperimental techniques are proposed and discussed.

Photon Wave-packet Manipulation via Dynamic Electromagnetically Induced Transparency in Multilayer Structures