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<p>Silicon is a common material of choice for semiconductor optics in the infrared spectral range, due to its low cost, well-developed high-volume manufacturing methods, high refractive index, and transparency. It is, however, typically ill-suited for applications in the visible range, due to its large absorption coefficient, especially for green and blue light. Counterintuitively, we demonstrate how ultra-thin crystalline meta-optics enable full-color imaging in the visible range. For this purpose, we employ an inverse design approach, which maximizes the volume under the broadband modulation transfer function of the meta-optics. Beyond that, we demonstrate polarization-multiplexed functionality in the visible. This is particularly important as polarization optics require high index materials, a characteristic often difficult to obtain in the visible.</p>

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Full color visible imaging with crystalline silicon meta-optics

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年6月18日

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  • Johannes E. Fröch,
  • Luocheng Huang,
  • Zhihao Zhou,
  • Virat Tara,
  • Zhuoran Fang,
  • Shane Colburn,
  • Alan Zhan,
  • Minho Choi,
  • Arnab Manna,
  • Andrew Tang,
  • Zheyi Han,
  • Karl F. Böhringer,
  • Arka Majumdar

摘要

Silicon is a common material of choice for semiconductor optics in the infrared spectral range, due to its low cost, well-developed high-volume manufacturing methods, high refractive index, and transparency. It is, however, typically ill-suited for applications in the visible range, due to its large absorption coefficient, especially for green and blue light. Counterintuitively, we demonstrate how ultra-thin crystalline meta-optics enable full-color imaging in the visible range. For this purpose, we employ an inverse design approach, which maximizes the volume under the broadband modulation transfer function of the meta-optics. Beyond that, we demonstrate polarization-multiplexed functionality in the visible. This is particularly important as polarization optics require high index materials, a characteristic often difficult to obtain in the visible.