Imbert-Fedorov shift at metamaterial interfaces

We analyze the transverse shift (Imbert-Fedorov shift) of a focused beam upon reflection at stratified (doubly dispersive) metamaterials. In deriving analytical expressions for the reflection of a focused beam at such an interface this shift can be quantitatively forecast. Solely based on symmetry considerations of the vectorial reflection coefficient we analyze potential geometries where such a shift occurs. Contrary to the common belief, this shift is observable for a linearly polarized beam at total internal reflection. Furthermore, we predict a giant Imbert-Fedorov shift if light is partially reflected at impedance-matched media.