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<p>The numerous fields of applications of the structured light which is spanning from optical communications to microscopy and quantum computing, call for new methods of generation of optical vortices. It is now demonstrated that metasurfaces-based nanophotonics platform provides reliable toolkit for the development of highly efficient, broadband, multifunctional single-layer structures for vortex generation and control. In this paper, an efficient and simple concept of broadband generation of collinear vortex visible beams is proposed using an aperiodic all-dielectric single-layer metasurface in the form of a composite golden-angle Vogel spiral. With the support of rigorous full-wave numerical simulations, two metasurface designs are investigated, one enabling the simultaneous generation of two collinear vortex beams having desired topological charges <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(l=\pm 2\)</EquationSource> </InlineEquation> and high mode purity over a wide wavelength range from 480 to 580&#xa0;nm, and other one forming single vortex beam with desired topological charge <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(l=+2\)</EquationSource> </InlineEquation> and a mode purity above <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(90\%\)</EquationSource> </InlineEquation> in a wide spectral range from 460 to 700&#xa0;nm which is as twice larger of previously reported results.</p>

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Exploiting aperiodic order in metasurface design to achieve multifunctionality and broadband operation in the visible range

  • 期刊论文

  • 发表日期：

    2026年5月12日

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  • Volodymyr I. Fesenko,
  • Erick R. Baca-Montero,
  • Igor V. Guryev,
  • Oleksiy V. Shulika

摘要

The numerous fields of applications of the structured light which is spanning from optical communications to microscopy and quantum computing, call for new methods of generation of optical vortices. It is now demonstrated that metasurfaces-based nanophotonics platform provides reliable toolkit for the development of highly efficient, broadband, multifunctional single-layer structures for vortex generation and control. In this paper, an efficient and simple concept of broadband generation of collinear vortex visible beams is proposed using an aperiodic all-dielectric single-layer metasurface in the form of a composite golden-angle Vogel spiral. With the support of rigorous full-wave numerical simulations, two metasurface designs are investigated, one enabling the simultaneous generation of two collinear vortex beams having desired topological charges \(l=\pm 2\) and high mode purity over a wide wavelength range from 480 to 580 nm, and other one forming single vortex beam with desired topological charge \(l=+2\) and a mode purity above \(90\%\) in a wide spectral range from 460 to 700 nm which is as twice larger of previously reported results.