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Generating Different Polarized Multiple Vortex Beams at Different Frequencies from Laminated Meta-Surface Lenses.

Pengfei Gao1, Rui Yang1

  • 1National Key Laboratory of Antennas and Microwave Technology, School of Electronic Engineering, Xidian University, Xi'an 710071, China.

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|January 21, 2022
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Summary

This study introduces a novel meta-surface lens capable of generating multiple orbital angular momentum (OAM) vortex beams at different frequencies and polarizations, enhancing optical communication systems.

Keywords:
meta-surface lensmultiple beamsorbital angular momentumpolarization

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Area of Science:

  • Optics and Photonics
  • Metamaterials
  • Electromagnetics

Background:

  • Orbital angular momentum (OAM) vortex beams offer unique properties for advanced optical applications.
  • Current methods for generating multiple OAM beams often face limitations in frequency and polarization control.
  • Metasurfaces provide a promising platform for manipulating light properties with subwavelength structures.

Purpose of the Study:

  • To demonstrate a laminated metasurface lens for generating multiple OAM vortex beams.
  • To achieve independent control over OAM states, frequencies, and polarizations.
  • To explore the potential for advanced vortex beam communication systems.

Main Methods:

  • Design and fabrication of a laminated metasurface lens comprising dual-polarized and frequency-selective meta-arrays.
  • Utilizing co-linearly polarized (LP) waves for direct penetration and OAM beam generation at one frequency.
  • Employing cross-LP wave conversion for OAM beam generation at a different frequency with polarization conversion.

Main Results:

  • Successful generation of multiple OAM vortex beams with distinct radiating states at different frequencies.
  • High-efficiency polarization conversion enabling OAM vortex radiations with varied directions and vortex modes.
  • Demonstration of orthogonal polarizations for synthesized OAM vortex beams at different frequencies.

Conclusions:

  • The developed laminated metasurface lens effectively synthesizes multiple OAM vortex beams with orthogonal polarizations across different frequencies.
  • This approach offers a versatile platform for advanced optical communication systems.
  • The design expands the diversity of meta-devices for sophisticated light manipulation.