  We investigate the localized surface modes in a structure consisting of the
cholesteric liquid crystal layer, a phase plate, and a metal layer. These modes
are analogous to the optical Tamm states. The nonreciprocal transmission of
polarized light propagating in the forward and backward directions is
established. It is demonstrated that the transmission spectrum can be
controlled by external fields acting on the cholesteric liquid crystal and by
varying the plane of polarization of the incident light. [The text is presented
both in English (pp 1-9) and in Russian (pp 10-19)]
