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[en] Two-dimensional photonic crystals (PCs) have a good modulation effect on the in-plane propagating light field, which enhance the Faraday rotation of MO material. However, for the axially propagating light field, the effect of PCs is limited. To overcome this, we present a method that is based on optical tunneling, and a large Faraday rotation and small ellipticity can be achieved through a Bi:YIG nanoparticle that is coated with a low-index SiO2 material. This model is composed of a Glass matrix of two-dimensional PCs filled with a Bi:YIG/ SiO2 nanoparticle at the point defect, which is compatible with traditional processes. The conversion of linear polarized light propagating axially was simulated by the finite difference time domain algorithm with MATLAB. The suggested model has Faraday rotation and an ellipticity of θF = 24.06° and εF = 0.012 for the wavelength λ = 975 nm. Graphical abstract: .