采用4×4传输矩阵法研究了两种结构一维磁光子晶体的光隔离特性.结构一在外加磁场与光路光轴方向呈52.0°时,用7.96 μm的总厚度在中心波长附近0.95 nm范围内实现了光隔离,在此范围之内法拉第旋转角和透射率分别在45°~50.65°和97.01%~99.96%之间波动,结构仅包含43层光学薄膜,易于实际制备;结构二在外加磁场与光路光轴方向呈32.7°时,用11.54 μm的总厚度在中心波长附近0.85 nm范围内实现了光隔离,在此范围之内法拉第旋转角和透射率分别在45°~48.55°和98.85%~100%之间波动,结构包含73层光学薄膜,与结构一相比,该结构具有更高的透射率和更平坦的光谱.用这两种结构的一维磁光子晶体代替目前商用磁光隔离器中的块状磁光介质,可实现磁光隔离器的集成化.

The 4×4 transfer matrix method was used to investigate the optical isolation property of two different one-dimensional magneto-photonic crystal structures. For the first structure, when the angle between applied magnetic field and optical axis was set as 52.0°, it could realize the optical isolation around 0.95 nm with total thickness of 7.96 μm, possesses Faraday rotation angle and transmittance wave were at 45°~50.65° and 97.01%~99.96%. This structure with 43 layers is applicable in the practical application and fabrication. Regarding the other structure, when the angle between applied magnetic field and optical axis was set as 32.7°, optical isolation reached 0.85 nm broad with total thickness of 11.54 μm, the Faraday rotation angle fluctuated from 45.0°~48.55° and the transmittance ranged from 98.85%~100%. Integrable optical isolators can be accessed by using the two proposed one-dimensional magneto-photonic crystal structures instead of the bulk type magneto-optical materials in bulk type optical isolator in commerce.