Nonreciprocal TE–TM Mode Conversion Based on Photonic Crystal Fiber of Air Holes Filled With Magnetic Fluid Into a Terbium Gallium Garnet Fiber

In this paper, we study the nonreciprocal TE-TM mode conversion phenomenon by the simulation of magnetophotonic crystal fiber (MPCF). This MPCF consists of a periodic triangular lattice of air holes filled with magnetic fluid (Fe₃O₄) into a terbium gallium garnet (TGG) fiber. It is well known that, owing to its excellent transparency properties and its resistant character to laser damage, TGG is always selected as a Faraday rotator material. Also, TGG has a high Verdet constant related to the Faraday rotation (FR) effect. Here, with the consideration of the effect of gyrotropy, our simulations are associated with some calculations of the FR and modal birefringence. In this MPCF, the light is guided by internal total reflection, like classical fibers. However, it is shown that the designed MPCF could function as a mode converter with much stronger conversion efficiency than the conventional fibers.