SURFACE AND GUIDED-WAVE POLARITON MODES OF MAGNETOPLASMA FILMS IN THEVOIGT GEOMETRY

We discuss retarded electromagnetic modes of a film containing one or two species of carriers in the presence of an in-plane magnetic field. It is assumed that the film is characterized by a gyrodielectric tens or containing cyclotron and plasma response. We deal with the Voigt ge ometry (propagation transverse to the field) for both a symmetric film and a film on a substrate. A detailed discussion is given of the guid ed-wave modes that occupy the bulk continuum region. For the symmetric film, dispersion curves of both surface-type and guided-wave modes ar e reciprocal, omega(-q) = omega(q), but field profiles are different f or +q and -q. For the film on a substrate both the dispersion curves a nd the field profiles are non-reciprocal. Numerical illustrations are given for the parameters of CMT, Cd1-xHgxTe.