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- W4387569595 abstract "We introduce a new paradigm for generating high-purity vortex beams with metasurfaces. By applying optical neural networks to a system of cascaded phase-only metasurfaces, we demonstrate the efficient generation of high-quality Laguerre-Gaussian (LG) vortex modes. Our approach is based on two metasurfaces where one metasurface redistributes the intensity profile of light in accord with Rayleigh-Sommerfeld diffraction rules, and then the second metasurface matches the required phases for the vortex beams. Consequently, we generate high-purity LGp,l optical modes with record-high Laguerre polynomial orders p = 10 and l = 200, and with the purity in p, l and relative conversion efficiency as 96.71%, 85.47%, and 70.48%, respectively. Our engineered cascaded metasurfaces suppress greatly the backward reflection with a ratio exceeding -17 dB. Such higher-order optical vortices with multiple orthogonal states can revolutionize next-generation optical information processing." @default.
- W4387569595 created "2023-10-13" @default.
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- W4387569595 date "2023-10-12" @default.
- W4387569595 modified "2023-10-16" @default.
- W4387569595 title "Cascaded metasurfaces for high-purity vortex generation" @default.
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- W4387569595 doi "https://doi.org/10.1038/s41467-023-42137-1" @default.
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