Fig. 1. Comparison between regular gratings with single-ridge and Dammann gratings

Fig. 2. Schematic of the relationship of Dammann gratings with other subjects

Fig. 3. Geometrical mode of the physical processing of Dammann gratings diffraction

Fig. 4. Schematic diagrams of discrete sampling of binary pure-phase Dammann gratings

Fig. 5. Schematics of the detour phase induced by the encoding grating. (a) Ideal grating without detour phase; (b) encoding grating with detour phase

Fig. 6. Representative works during the evolutionary history of Dammann grating

Fig. 7. Representative work during the developing stage of the evolutionary history of Dammann gratings

Fig. 8. Representative work during the recent advanced stage of the evolutionary history of Dammann gratings

Fig. 9. Schematics of Dammann gratings multi-focus processing. (a) Traditional single focus processing; (b) horizontal multi-focus parallel processing; (c) multi-focal invisible cutting along the axial direction

Fig. 10. Magneto-optical trap for trapping atoms based on integrated beam slitting grating^[303]. (a) Overall optical path; (b) local geometrical structure of the metasurface beam slitting grating with depth of 392 nm; (c) top-view scanning electron microscopy image of the metasurface grating sample, with scale bar of 1 μm