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Planar optical elements that can manipulate the multidimensional physical parameters of light efficiently and compactly are highly sought after in modern optics and nanophotonics. In recent years, the geometric phase, induced by the photonic spin–orbit interaction, has attracted extensive attention for planar optics due to its powerful beam shaping capability. The geometric phase can usually be generated...
Liquid‐crystal fork gratings are demonstrated through photopatterning realized on a DMD‐based microlithography system. This supplies a new strategy for generating fast switchable, reconfigurable, wavelength‐tolerant and polarization‐insensitive optical vortices. The technique has great potential in broad fields such as OAM‐based quantum computations, optical communications, and micromanipulation....
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