Magneto-optical properties of magnetic photonic crystal fiber of terbium gallium garnet filled with magnetic fluid

Abstract We present in this work, magneto-optical (MO) properties of a magnetophotonic crystal fiber (MPCF) based on terbium gallium garnet Tb 3 Ga 5 O 12 or TGG. The air holes of a periodic triangular lattice are filled with magnetic fluid (MF). With a light which can be confined in the core area of this MF filled MPCF we obtain a confinement corresponding to the propagation of the single mode by assuming an effective index ( n eff ). The variations of n eff as a function of the gyrotropy parameter ( g ) and magnetic nanoparticle volume fraction concentrations are well established at the telecommunication wavelength λ  = 1.55 μm. The TE-TM mode conversion based on the Faraday rotation and modal birefringence are then numerically simulated. Faraday rotation exhibits largest value of 8700.08°/cm at MF concentration of 0.25% and g  = 0.0144, whereas the modal birefringence is reduced to 0.00177 at the same conditions. These results could be helpful for experimentally designing and realizing isolators with these filled MF-MPCFs based on this TGG material. They appear to possess significant potential for the practical applications due to their unique MO properties.