Author Affiliations
1Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen , Guangdong 518055, China2Shenzhen Orbbec Co., Ltd., Shenzhen , Guangdong 518057, China3College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen , Guangdong 518060, China4School of Information Science Technology, University of Science and Technology of China, Hefei , Anhui 230026, Chinashow less
Fig. 1. Traditional diffractive optical elements used in the generation of vortex beam. (a) Spiraling phase plate; (b) simulated phase pattern; (c) holographic grating
Fig. 2. Real images for two spatial light modulators. (a) Liquid-crystal spatial light modulator; (b) digital micromirror device
Fig. 3. Trait of DMD as an optical switch and its inner structure
Fig. 4. Principle of focusing light through scattering medium. (a) Random speckle formed by the unmodulated beam through scattering medium; (b) focusing light obtained by the modulated beam through scattering medium
Fig. 5. Comparison of focusing effect between slow and high-speed wavefront modulation systems when light travels through a transient medium
[27]. (a) (b) Holograms recording in a low or high-speed wavefront modulation system; (c) (d) intensity profiles after optically reading the corresponding holograms
Fig. 6. DMD-based high-speed wavefront modulation system
[32]. (a) Simplified schematic; (b) optical path schematic of the recording step; (c) optical path schematic of the playback step
Fig. 7. 4f optical system used for preparing the structured beams combined with a filter
Fig. 8. Schematic diagram of error diffusion method
[69]. (a) Gray value normalization of grayscale hologram; (b) specific algorithm execution process
Fig. 9. Simulation of using Lee and optimized Lee method to generate high-order Bessel beam (
), respectively
[69]. (a) (b) (c) Theoretical high-order Bessel beams; (d) (e) (f) coding results of Lee algorithm; (g) (h) (i) coding results of optimized Lee algorithm
Fig. 10. Schematic diagrams of the super-pixel method
[71]. (a) In the DMD plane, the light field
E(
x) corresponds to the off and on states of the micromirrors; (b) schmetic of aperture positioned on the Fourier plane; (c) phase responses of the three pixels indicated by grey squares; (d) response of superpixel in the target plane, in which
Esuperpixel is the sum of the three pixels' responses
Fig. 11. Electric field distribution of a single super-pixel in the target plane
[71]. (a)
n=3; (b)
n=4
Fig. 12. Schematic diagram of binary amplitude holography based on the deep learning
[73]