Improvement of the polar magneto-optical Kerr effect in the spatial tunable one-dimensional magnetophotonic crystals

We have studied the magnetophotonic crystals (MPCs) with excellent capabilities to enhance reflection and Kerr rotation simultaneously. In order to simultaneously investigate the symmetric and nonsymmetric spatial structures, we have considered the different repetition numbers for dielectric photonic crystals around the magnetic defect layer. To construction of dielectric Bragg mirrors, we have used of Al2O3 due to low refractive index and its unique optical features. The Ce:YIG with high magneto-optical features is utilized as magnetic material to increasing the magneto-optical responses of structures. By adjusting spatial features such as repetition numbers of PCs and thickness of magnetic defect layers, we have achieved the magneto-optical Kerr rotation more than 70 degrees and reflection close to 1. We have introduced the structures with single and several cavities. For investigation of light localization at defect layer, the electric field distribution along the MPCs is simulated using finite element method (FEM). With light localization inside the cavity and multiple reflections in it, the magneto-optical (MO) responses of these MPCs are significantly increased. Our proposed structures having high MO responses, are suitable cases to design MO elements incorporated in integrated photonic devices and optical telecommunication tools.