Use of uniaxial ferroelectric material as a tunable double-optical filter based on polarization converter and splitting in photonic crystal

We have investigated the tunability of splitting, intensity and polarization conversion of the double optical filter in a one-dimensional photonic crystal (1DPC) structure containing anisotropic ferroelectric material, based on the Pockels effect. A 4 × 4 transfer matrix method has been used to investigate the optical properties of the proposed structure at oblique incidence of light with S polarized wave. The influences of the external electric field, and incidence angle on the tunability of the transmission and polarization conversion of the optical filter, will be investigated. Numerical results exhibit that large splitting and blue shifting of the defect modes can be achieved in the presence of the external electric field and incidence angle, respectively. Also, the results reveal that by the application of an external electric field to the anisotropic layer, for an incident plane wave with (S)-polarization, two transmitted wave containing both P and (S)-polarized wave is created. Moreover, by increasing the external electric field and incidence angle, the edges and wide of photonic band for two transmission coefficient TSS and TSP can be modulated.