Considering the property that magnetic permeability of the ferrite material changes under the control of an external magnetic field

a novel scheme of THz routing optical switch and beam splitter

based on two-dimensional magnetic photonic crystals

is proposed.Theoretical analysis and numerical simulation is conducted by Plane Wave Method（PWM）and FiniteDifference Time-Domain（FDTD）.The results show that

the insertion loss of the routing optical switch is 0.017 dB

the extinction ratio is 26.97 dB

and the maximum stability time is 25.3ps.Moreover

the additional loss of the beam splitter is only0.07 dB

and the splitting ratio is nearly 1∶1.The routing optical switch and beam splitter are achieved by using these two-dimensional magnetic photonic crystals

which have important application prospect in future integrated optical circuit.