Fig. 1. Working principle of far-field super-resolution focusing based on spatial light modulator

Fig. 2. Flowchart of binary particle swarm algorithm for optimal design of super-oscillatory mask

Fig. 3. Phase modulation distribution of super-oscillatory mask. (a) Grayscale image of phase distribution of super-oscillatory mask; (b) phase distribution along radial direction

Fig. 4. Theoretical design results. (a) Propagation plane optical field intensity; (b) propagation direction peak intensity, transverse FWHM and side lobe ratio curves; (c) focal plane optical field intensity; (d) field intensity curve along radius through center of focal spot

Fig. 5. Schematic diagram of the platform for far-field super-resolution focusing optical field construction and measurement platform based on spatial light modulator

Fig. 6. Experimental test results of propagation direction. (a) XZ plane optical field intensity; (b) YZ plane optical field intensity; (c) peak intensity, transverse FWHM and side lobe ratio curves

Fig. 7. Experimental results of optical field cross section. (a) Intensity of light field in XZ plane; (b)-(e) intensity of light field in XY plane at Z of 186.50, 188.50, 190.50, 192.50 mm; (f)-(i) intensity distribution curves at Z of 186.50, 188.50, 190.50, 192.50 mm