In recent years, much effort is dedicated to the generation of vectorial optical fields with an arbitrary spatially varying polarization distribution by means of metasurfaces. However, simultaneous and independent control of the amplitude, phase, and polarization is still challenging, especially for the multichannel generation of a vectorial optical field with an angle‐multiplexed functionality. Here, a facile route, called coherent pixel polarization metaholography, is proposed to realize multichannel, angle‐multiplexed, and arbitrary spatially varying polarization fields and demonstrate how to enable a fully independent realization of full Poincaré beams (lemon, start, spider, and web beams), dual‐way switching print images, vectorial print images, and optical polarization knot profiles. Importantly, the demonstrated angle‐multiplexed metasurfaces have an independently controllable handedness and azimuth and can possess up to four channels. Such angle‐multiplexed multichannel arbitrary spatial polarization fields may enable various applications, including optical dynamic displays, information communication, optical encryption, and quantum experiments.
We extend the concept of spiral zone plates along the optical axis and define a specific single optical element, termed as single-focus spiral zone plates (SFSZPs), for the generation of a single-focus vortex beam. The key idea is to make the transmittance of the spiral zone plates sinusoidal in the azimuthal direction. Furthermore, a two-parameter modified sinusoidal apodization window is introduced to modulate the transmittance function. Theoretical analysis reveals that the third-order diffraction light intensity of the SFSZPs could be reduced by more than three orders of magnitude compared to a conventional spiral zone plate. The experimental results are also presented, confirming the desired single-focus characteristics. The unique single-focus phase singularity properties imply that SFSZPs may find a wide range of imaging and microscopy applications, as well as fundamental studies of vortex beams.
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