Mode interactions in chirowaveguides

Chirality may provide the coupling, and hence the conversion, between two eigen polarization modes: TE and TM modes. In this paper an analysis of mode interaction in chirowaveguides is realized, taking into account longitudinal components of polarization currents. Special consideration is given to so-called induced polarization effects which are caused by abrupt discontinuities of longitudinal polarization currents on the boundary of chiral-nonchiral media. Because of induced polarization effects, an asymmetry in mode coupling may take place. The method of investigation may be a powerful tool for the analysis of mode interactions due to both material and geometric effects. (C) 1996 American Institute of Physics.