采用4×4传输矩阵法研究了复合一维磁光子晶体隔离器的特性,当外加磁场与光路光轴方向夹角为19.95°时,用20.16 μm的总厚度实现了中心波长附近3.1 nm的宽带光隔离,当光线入射角为3.9°时,仍可实现1.06 nm的宽带滤波,且其透射谱平坦性良好.该光隔离器可以同时满足隔离宽度、透射谱平坦性以及对光线入射角宽容性的要求,在实际运用中具有重要的实用价值.

A composite optical isolator of one-dimensional magneto-photonic crystals was presented. The 4×4 transfer matrix method used to investigate the optical isolation property of this isolator. When the angel between applied magnetic field and optical axis of optical path is 19.95°,with the total thickness of 20.16 μm,it can realize the optical isolation around 3.1 nm. When the incident angle is 3.9°,it can also realize the optical isolation around 1.06 nm with flat-top responses. The structure can realized broadband isolation,flat-top responses and has great tolerance of incident angle at the same time. It has a high valuation in practical application.