  Surface wave propagation at the interface between different types of
gyrotropic materials and an isotropic negatively refracting medium, in which
the relative permittivity and relative permeability are, simultaneously,
negative is investigated. A general approach is taken that embraces both
gyroelectric and gyromagnetic materials, permitting the possibility of
operating in either the low GHz, THz or the optical frequency regimes. The
classical transverse Voigt configuration is adopted and a complete analysis of
non-reciprocal surface wave dispersion is presented. The impact of the surface
polariton modes upon the reflection of both plane waves and beams is discussed
in terms of resonances and an example of the influence upon the Goos-Hanchen
shift is given.
