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<p>Miniaturized devices that can split light into different wavelengths are of use in spectroscopic applications such as light analysis, spectral imaging, optical sensing and measurement. However, despite recent developments, achieving a microscale optical dispersion component that can deliver multiple spectral responses without applying external stimuli remains difficult. Here we show that ultrafast-laser-induced micro-vortices in polycarbonate substrates can be used to generate intricate dispersion signals at the microscale. The approach, which is based on the photoelastic effect, can provide rich and varied spectral responses for efficient sampling. The dispersive structures operate over a broad bandwidth (400–1,550 nm), occupy a compact footprint (10 × 10 µm<sup>2</sup>) and are independent of the viewing angle. The approach is also applicable to different thermoplastic polymers and is robust against harsh conditions. We show that the micro-vortex structures can be integrated with an image sensor for on-chip spectral analysis and high-resolution microscopic spectral imaging.</p>

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Optical dispersion using micro-vortices in thermoplastic polymers for integrated microspectrometers

  • 期刊论文

  • 发表日期：

    2026年4月20日

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  • Bo Zhang,
  • Shiqi Liu,
  • Fanrong Zeng,
  • Beibei Xu,
  • Jihong Han,
  • Han Lin,
  • Baohua Jia,
  • Zongyin Yang,
  • Zhuo Wang,
  • Jianrong Qiu

摘要

Miniaturized devices that can split light into different wavelengths are of use in spectroscopic applications such as light analysis, spectral imaging, optical sensing and measurement. However, despite recent developments, achieving a microscale optical dispersion component that can deliver multiple spectral responses without applying external stimuli remains difficult. Here we show that ultrafast-laser-induced micro-vortices in polycarbonate substrates can be used to generate intricate dispersion signals at the microscale. The approach, which is based on the photoelastic effect, can provide rich and varied spectral responses for efficient sampling. The dispersive structures operate over a broad bandwidth (400–1,550 nm), occupy a compact footprint (10 × 10 µm2) and are independent of the viewing angle. The approach is also applicable to different thermoplastic polymers and is robust against harsh conditions. We show that the micro-vortex structures can be integrated with an image sensor for on-chip spectral analysis and high-resolution microscopic spectral imaging.