Design of nonreciprocal waveguide devices based on two-dimensional magneto-optical photonic crystals

•A kind of isolator is designed with good performances and easy to fabricate.•A kind of circulator is designed with new and simple waveguide cross structure.•A crossing waveguide is designed with large bandwidth and low crosstalk.

AbstractIsolator, circulator and crossing waveguide devices based on two-dimensional magneto-optical photonic crystals were designed. The dispersion relation, mode distribution and transmission spectrum for these nonreciprocal devices were analysed using the finite element method. An isolator, a four-port circulator and a low-crosstalk crossing waveguide with a continual one-way transmission bandwidth of 10.6%, a circulation bandwidth of 4.7% and a low-crosstalk bandwidth of 16.6% were fabricated, respectively.