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<p>In this study, a dynamically tunable dielectric metasurface based on Ge<sub>2</sub>Sb<sub>2</sub>Te<sub>5</sub>(GST) phase-change material is proposed for generating and modulating vector vortex beams in the near-infrared band. While the single-phase modulation of conventional metasurfaces limits design flexibility, the phase-change properties of GST materials offer new possibilities for dynamic optical modulation. The generation of vector vortex beams is realized by superimposing two vortex beams with the same radius but different topological charges, and the tunability of the GST material in different phase states makes the switching of the beams more flexible, which further strengthens the degree of freedom of the modulation. In addition, by tuning the incident polarization, the metasurface can generate different elliptical and circular Poncelet beams, thus precisely controlling the beam characteristics. This study provides a new technological platform and a wide range of applications for multifunctional optics, dynamic beam control, optical communication, and information processing.</p>

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Near-Infrared Vector Vortex Beam Generation and Dynamic Control Based on Ge2Sb2Te5 Metasurface

  • 期刊论文

  • 发表日期：

    2026年1月5日

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  • Bin Lou,
  • Weiwei Tao,
  • Xiaomei Zhang,
  • Ying Tian

摘要

In this study, a dynamically tunable dielectric metasurface based on Ge2Sb2Te5(GST) phase-change material is proposed for generating and modulating vector vortex beams in the near-infrared band. While the single-phase modulation of conventional metasurfaces limits design flexibility, the phase-change properties of GST materials offer new possibilities for dynamic optical modulation. The generation of vector vortex beams is realized by superimposing two vortex beams with the same radius but different topological charges, and the tunability of the GST material in different phase states makes the switching of the beams more flexible, which further strengthens the degree of freedom of the modulation. In addition, by tuning the incident polarization, the metasurface can generate different elliptical and circular Poncelet beams, thus precisely controlling the beam characteristics. This study provides a new technological platform and a wide range of applications for multifunctional optics, dynamic beam control, optical communication, and information processing.