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Multifunctional Optical Vortex Beam Generator via Cross-Phase Based on Metasurface.

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Summary

This study introduces a novel optical vortex beam (OVB) generator using metasurfaces. It enables precise control over topological charges and beam shaping, advancing optical communication and manipulation technologies.

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Area of Science:

  • Optics and Photonics
  • Metamaterials
  • Beam Physics

Background:

  • Optical vortex beams (OVBs) are crucial for advanced optical applications.
  • Controlling OVB properties like topological charge and spatial structure is challenging.
  • Metasurfaces offer a promising platform for compact and versatile optical devices.

Purpose of the Study:

  • To propose and demonstrate a multifunctional optical vortex beam generator using a metasurface.
  • To investigate the modulation of OVBs by low-order cross-phase (LOCP) and high-order cross-phase (HOCP).
  • To achieve tunable rotation, polygonal beam generation, and singularity manipulation.

Main Methods:

  • Design and fabrication of a metasurface-based OVB generator.
  • Experimental investigation of OVB propagation characteristics under LOCP and HOCP modulation.
  • Analysis of topological charge measurement, rotation tunability, and polygonal beam formation.

Main Results:

  • LOCP modulation allows topological charge measurement for any OVB order and enables rotation tunability.
  • HOCP modulation facilitates polygonal beam generation and singularity regulation, with the order matching the polygon's sides.
  • Beam dimensions increase with distance, and singularity spacing is controllable.

Conclusions:

  • The proposed OVB generator offers a simple strategy for simultaneous topological charge detection, OVB shaping, and singularity manipulation.
  • This work paves the way for advancements in photon manipulation, optical communication, and vortex beam modulation.