Magneto-optics of a thin film layer with helical structure and enormous anisotropy

The influence of an external magnetic field onto the magneto-optical properties of media with a helical periodical structure is discussed. The case of light normal incidence is considered, and it is assumed that the external magnetic field is directed along medium axis. The transmission and reflection of the light incident normal onto a thin film having a helical structure and being in external magnetic field is discussed. The Jones matrices for this system have been constructed. It is shown that at certain values of magneto-optical activity and local anisotropy a new diffraction reflection region rises. This system can be used as a narrow-band filter with controlled bandwidth. It is shown that at certain conditions this system can work also as an ideal optical diode or one-sided reflector. The specific features of eigenpolarizations are also discussed, and it is shown that the very dependences of eigenpolarizations onto external magnetic field direction conditions great values of nonreciprocal transmission.