Waves in a slab of uniaxial BW medium

Certain isotropic and anisotropic media with negative permittivity and/or permeability parameters have been recently labeled as BW-media due to their capability of supporting backward waves. Various suggestions for constructing composite materials realizing such media (also called metamaterials) have also been recently suggested. The present analysis considers guidance of waves in a slab of uniaxially anisotropic BW medium with at least one of the four medium parameters negative. It is shown that there exist odd and even TE and TM modes in such a slab capable of carrying energy in opposite directions inside and outside the slab with backward waves inside the slab.