Faraday Effect in Bi-Periodic Photonic-Magnonic Crystals

We present a theoretical investigation of the polarization plane rotation at light transmission-Faraday effect, through 1-D multilayered magneto-photonic systems consisting of periodically distributed magnetic and dielectric layers. We calculate Faraday rotation (FR) spectra of photonic-magnonic crystals, where cell (or supercell) is composed of magnetic layer and dielectric layer (or section of dielectric photonic crystal). We found that the FR of p-polarized incident light is increasing in the transmission band with the number of magnetic supercells. The increase of FR is observed also in vicinity of the band-gap modes localized in magnetic layers but the maximal polarization plane rotation angles are reached at minimal transmittivity. We show that presence of linear magneto-electric interaction in the magnetic layers leads to significant increase of the FR angles of s-polarized incident light in the vicinity of the fine-structured modes inside the photonic-band-gap.