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Abstract
An optimization approach is used in the design of weakly reflecting plane-stratified slabs where transient plane waves impinges obliquely. The slabs are dispersive with a spatially varying impedance and conductivity. In the optimization process, the direct problem is solved iteratively by a time-domain Green functions technique which deals with scattering kernels. Given the prescribed reflection and transmission kernels, an objective functional is minimized for a time larger than one roundtrip and for given incident directions. By introducing dual functions, the exact and explicit expressions for the gradients are derived for the TE and TM modes.