Fig. 1. Schematic of Y-type Terahertz wave to beam splitter based on two-dimensional photonic crystal

Fig. 2. TE mode and TM mode band diagram of photonic crystal

Fig. 3. Transmission spectrum of two output ports

Fig. 4. The relationship between the transmittance of the output port and the refractive index of the point defect

Fig. 5. The relationship between the refractive index of point defect and light intensity

Fig. 6. （a）Steady-state filed intensity distribution and（b）time domain steady state diagram with a split ratio of 1:1

Fig. 7. （a）Steady-state filed intensity distribution and（b）time domain steady state diagram with a split ratio of 1:2

Fig. 8. （a）Steady-state filed intensity distribution and（b）time domain steady state diagram with a split ratio of 1:4