Scattering by lossless double-negative metamaterial slabs

An approach is here proposed for evaluating the scattering by a lossless and isotropic double-negative metamaterial slab illuminated by a plane wave at oblique incidence. The total field at a given point is evaluated by adding the Geometrical Optics contributions and the field diffracted by the edge. This last contribution is determined by using a Uniform Asymptotic Physical Optics solution expressed in terms of the standard transition function of the Uniform Theory of Diffraction. As demonstrated by many numerical simulations, it has resulted to be efficient and simple to implement in a computer code.