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<p>Metasurfaces offer unique advantages in manipulating the dispersion of optical fields; yet the achievable dispersion of metasurfaces has long been constrained by the limited phase modulation of complex nanostructures. Here we introduce a metasurface design method based on convergence phase that enables ultra-dispersive metasurfaces using structurally simple nanopillars with relaxed fabrication requirements. By overlapping phase of multiple wavelengths with that of a central wavelength, we demonstrated an ultra-dispersive metalens supporting phase variations exceeding 1200π – a more than 30-fold enhancement over existing approaches. Leveraging this method, we fabricated metalenses that exhibit unprecedented dispersion characteristics and implemented the metalens in a miniaturized chromatic confocal sensor for a measurement range of 13 mm with an axial resolution of 50 nm. Additionally, we demonstrated millimeter-scale depth-of-field spectral tomography, highlighting the significant advantage and immense potential of our method. Our research has established a generalizable theoretical foundation for designing ultra-dispersive metasurfaces that can be mass-produced and deployed for practical applications.</p>

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Ultra-dispersive metasurfaces enabled by convergence-phase design using simplified nanopillar arrays

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月27日

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  • Yunquan Wu,
  • Zhichen Cao,
  • Hao Wang,
  • Xinwei Wang,
  • Huijie Hao,
  • Suping Chang,
  • Wei Chen,
  • Xumin Ding,
  • Joel K. W. Yang,
  • Wenlong Lu

摘要

Metasurfaces offer unique advantages in manipulating the dispersion of optical fields; yet the achievable dispersion of metasurfaces has long been constrained by the limited phase modulation of complex nanostructures. Here we introduce a metasurface design method based on convergence phase that enables ultra-dispersive metasurfaces using structurally simple nanopillars with relaxed fabrication requirements. By overlapping phase of multiple wavelengths with that of a central wavelength, we demonstrated an ultra-dispersive metalens supporting phase variations exceeding 1200π – a more than 30-fold enhancement over existing approaches. Leveraging this method, we fabricated metalenses that exhibit unprecedented dispersion characteristics and implemented the metalens in a miniaturized chromatic confocal sensor for a measurement range of 13 mm with an axial resolution of 50 nm. Additionally, we demonstrated millimeter-scale depth-of-field spectral tomography, highlighting the significant advantage and immense potential of our method. Our research has established a generalizable theoretical foundation for designing ultra-dispersive metasurfaces that can be mass-produced and deployed for practical applications.