Fig. 1. Dispersion curve of square-lattice photonic crystal

Fig. 2. Single waveguide structure and light field diagram. (a) Structure; (b) light field

Fig. 3. Relationship between radiation distance of a single waveguide and radiation efficiency

Fig. 4. Different transmission structures and their transmittance maps. (a) Structure with Y-shaped defect; (c) structure with T-shaped defect

Fig. 5. Relationship between radiation time and radiation efficiency

Fig. 6. Photonic crystal structure with different number of exit ports. (a) The number of exit ports is 2; (b) the number of exit ports is 4; (c) the number of exit ports is 8; (d) the number of exit ports is 16

Fig. 7. Relationship between radiation time and radiation distance at different numbers of exit ports

Fig. 8. Relationship between radiation distance and radiation efficiency at different numbers of exit ports

Fig. 9. Period of exit ports and and its relationship with radiation distance. (a) Period of exit ports; (b) relationship between period of exit ports and radiation distance

Fig. 10. Light field diagram when the number of exit ports is 16 and the period of exit ports is 4