Scholarlink

<p>Nonlinear frequency upconversion of mid-infrared (MIR) light is of particular importance for infrared imaging, detection and spectroscopy. However, achieving efficient and broadband MIR upconversion is hindered by phase-matching constraints and limited nonlinear coefficients of optical materials. Here, we demonstrate phase-matching-free, broadband and efficient multiphoton frequency upconversion in NbOI<sub>2</sub>. We observe generation of harmonics from the second to the 11th order, with upconverted signals spanning from the MIR to the ultraviolet. We also achieve nonlinear frequency mixing in the broad spectral window of 1500-5000 nm, including degenerate four-wave mixing, sum-frequency mixing and sum-frequency generation with an efficiency up to 6×10<sup>-</sup>⁴ W<sup>-</sup>¹, surpassing those of leading metasurface-based platforms. Finally, we demonstrate broadband MIR upconversion imaging by direct detection from a conventional silicon camera. Our results establish NbOI<sub>2</sub> as a promising platform for MIR nanophotonics, enabling advanced applications in ultrabroadband imaging, sensing and spectral conversion.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Mid-infrared to ultraviolet efficient multiphoton frequency upconversion in NbOI2 crystals

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年3月14日

查看全文
  • Song Zhu,
  • Xuan Mao,
  • Congliao Yan,
  • Fakun Wang,
  • Zhen Xu,
  • Hao Hu,
  • Xiaodong Xu,
  • Yuqiang Fang,
  • Fangyuan Sun,
  • Ruihuan Duan,
  • Yao Wu,
  • Yuhui Yang,
  • Chongwu Wang,
  • Zhen Qiao,
  • Wenduo Chen,
  • Houkun Liang,
  • Fuqiang Huang,
  • Zheng Liu,
  • Yu Luo,
  • Qi Jie Wang

摘要

Nonlinear frequency upconversion of mid-infrared (MIR) light is of particular importance for infrared imaging, detection and spectroscopy. However, achieving efficient and broadband MIR upconversion is hindered by phase-matching constraints and limited nonlinear coefficients of optical materials. Here, we demonstrate phase-matching-free, broadband and efficient multiphoton frequency upconversion in NbOI2. We observe generation of harmonics from the second to the 11th order, with upconverted signals spanning from the MIR to the ultraviolet. We also achieve nonlinear frequency mixing in the broad spectral window of 1500-5000 nm, including degenerate four-wave mixing, sum-frequency mixing and sum-frequency generation with an efficiency up to 6×10-⁴ W-¹, surpassing those of leading metasurface-based platforms. Finally, we demonstrate broadband MIR upconversion imaging by direct detection from a conventional silicon camera. Our results establish NbOI2 as a promising platform for MIR nanophotonics, enabling advanced applications in ultrabroadband imaging, sensing and spectral conversion.