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Switchable phase and polarization singular beams generation using dielectric metasurfaces.

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Dielectric metasurfaces enable flexible generation and switching of singular beams, including vortex and cylindrical vector beams, at 1550 nm. This offers advanced optical field manipulation capabilities with high efficiency.

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Area of Science:

  • Optics and Photonics
  • Metamaterials
  • Laser Physics

Background:

  • Singular beams with helical phase or inhomogeneous polarization offer advanced optical field control.
  • Conventional methods struggle with flexible switching between different singular beam types.

Purpose of the Study:

  • To demonstrate dielectric metasurfaces for generating and switching between multiple singular beam types.
  • To investigate the use of cascaded metasurfaces for complex beam generation.
  • To experimentally validate the switching of cylindrical vector beams to vortex beams.

Main Methods:

  • Fabrication and characterization of dielectric metasurfaces.
  • Generation of vortex beams and cylindrical vector beams using a single metasurface.
  • Generation of cylindrical vector vortex beams using two cascaded metasurfaces.
  • Experimental demonstration of switching between cylindrical vector and vortex beams using optical components.

Main Results:

  • Successful generation of vortex beams and cylindrical vector beams with a single metasurface.
  • Demonstration of cylindrical vector vortex beam generation using cascaded metasurfaces.
  • Achieved switching from cylindrical vector beams to vortex beams with a conversion efficiency of 47.7%.

Conclusions:

  • Dielectric metasurfaces provide a versatile platform for generating and manipulating singular beams.
  • The demonstrated switching capability enhances the flexibility of optical field control.
  • Experimental results align with theoretical predictions, validating the metasurface approach.