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Full-polarization-locked vortex beam generator with time-varying characteristics.

Lixin Jiang1, Yongfeng Li1, Hao Yang1

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This study presents a novel metasurface strategy for generating reconfigurable vortex beams from arbitrary polarized light. This breakthrough enables advanced applications in optical communications and imaging.

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Area of Science:

  • Optics and Photonics
  • Metamaterials
  • Electromagnetics

Background:

  • Vortex beams with orbital angular momentum (OAM) are crucial for super-resolution imaging, high-capacity communications, and quantum optics.
  • Metasurfaces offer advanced capabilities for vortex beam generation, but controlling reconfigurability with arbitrary polarization remains challenging.

Purpose of the Study:

  • To propose an efficient and reconfigurable strategy for generating polarization-locked, fully polarized vortex beams from arbitrary polarized electromagnetic waves.
  • To design, fabricate, and validate a vortex beam generator prototype based on the proposed strategy.

Main Methods:

  • Utilizing Pancharatnam-Berry (PB) phase modulation for circularly polarized waves.
  • Employing dynamic phase modulation for linearly polarized waves.
  • Designing and fabricating a metasurface-based vortex beam generator prototype.

Main Results:

  • Demonstrated a polarization-locked fully polarized vortex beams generator.
  • Verified the rotating Doppler effect and generated a time-varying vortex beam.
  • Experimental results validated by simulations and measurements.

Conclusions:

  • The proposed strategy offers an efficient method for generating reconfigurable vortex beams with arbitrary polarization.
  • The developed vortex beam generator has potential applications in information encryption, biosensing, and OAM multiplexing communication.
  • The strategy is adaptable to various frequency regions.