Fig. 1. Schematic diagram of the principle of calculating tightly focused fields

Fig. 2. Schematic diagram of the phase pattern optimization process for multi-focus generation

Fig. 3. Schematic of the experimental setup

Fig. 4. Unoptimized lateral two-dimensional multifocal array on the focal plane

Fig. 5. Variation curve of uniformity of different focus arrays with the number of iterations in the optimization process

Fig. 6. Optimized lateral two-dimensional multifocal array on the focal plane

Fig. 7. W-shaped multifocal pattern with an intensity distribution of 3∶1∶2