Fig. 1. Schematic of planar structure and focusing light path of Dammann zone plate. (a) Planar structure of Dammann zone plate; (b) multi-focal system based on Dammann zone plate

Fig. 2. 1×5 Dammann zone plate. (a) Transmission function of 1×5 Dammann zone plate; (b) axial normalized intensity distribution of Dammann zone plate

Fig. 3. Dammann zone plate.(a) Design diagram of Dammann zone plate; (b) sample diagram of Dammann zone plate

Fig. 4. Experimental verification optical path of Dammann zone plate

Fig. 5. Intensity distribution of transverse two-dimensional light field of five axial focal spots of Dammann zone plate (1×5)

Fig. 6. Axial normalized intensity distribution of Dammann zone plate

Fig. 7. Axial normalized intensity distribution of Dammann zone plate

Fig. 8. Axial intensity distributions of Dammann zone plate with different precisions. (a) Precision is 0.0001; (b) precision is 0.001; (c) precision is 0.01

Fig. 9. Multi-focal intraocular lens based on Dammann zone plate