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We experimentally demonstrate that dielectric metasurface can generate multi-channel vortex beams possessing different orbital angular momentums with arbitrarily engineered spin-orbit interactions. We propose a design principle of the proposed meta-atom that can modulate and switch spatial complex-amplitude information. Experimental results show that the proposed metasurface can generate multi-channel vortex beam arrays without interval noises, and it can make each vortex beam channel possess different spin-orbit conversion when the incident polarization is changed. These results provide a new opportunity to implement a novel vortex beam modulator, which can be applied for future development of quantum optics and optical communications.
Gun-Yeal Lee,Jangwoon Sung, andByoungho Lee
"Dielectric metasurfaces for arbitrary engineering of multi-channel spin-orbit interactions", Proc. SPIE 11498, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications XIV, 114980N (20 August 2020); https://doi.org/10.1117/12.2568381
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Gun-Yeal Lee, Jangwoon Sung, Byoungho Lee, "Dielectric metasurfaces for arbitrary engineering of multi-channel spin-orbit interactions," Proc. SPIE 11498, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications XIV, 114980N (20 August 2020); https://doi.org/10.1117/12.2568381