Spectral characteristics of a Fabry-Perot resonator with controlled gyrotropy

The propagation of light through a system consisting of two naturally gyrotropic layers placed in a magnetic field with an isotropic layer in between is considered. The effect of gyrotropy on the interference amplification of light in a nonreciprocal Fabry-Perot resonator is studied. It is shown that, at normal incidence of light, the system offers a high controllable rotatory power and a high transmissivity and also exhibits no polarization ellipticity.