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Large area single crystal gold of single nanometer thickness for nanophotonics

Author

Listed:
  • Chenxinyu Pan

    (Zhejiang University)

  • Yuanbiao Tong

    (Zhejiang University)

  • Haoliang Qian

    (Zhejiang University)

  • Alexey V. Krasavin

    (King’s College London)

  • Jialin Li

    (Zhejiang University)

  • Jiajie Zhu

    (Zhejiang University)

  • Yiyun Zhang

    (Zhejiang University)

  • Bowen Cui

    (Zhejiang University)

  • Zhiyong Li

    (Zhejiang University
    Jiaxing Key Laboratory of Photonic Sensing & Intelligent Imaging
    Jiaxing Research Institute Zhejiang University)

  • Chenming Wu

    (Zhejiang University)

  • Lufang Liu

    (Zhejiang University)

  • Linjun Li

    (Zhejiang University
    Jiaxing Key Laboratory of Photonic Sensing & Intelligent Imaging
    Jiaxing Research Institute Zhejiang University)

  • Xin Guo

    (Zhejiang University
    Jiaxing Key Laboratory of Photonic Sensing & Intelligent Imaging
    Jiaxing Research Institute Zhejiang University)

  • Anatoly V. Zayats

    (King’s College London)

  • Limin Tong

    (Zhejiang University
    Shanxi University)

  • Pan Wang

    (Zhejiang University
    Jiaxing Key Laboratory of Photonic Sensing & Intelligent Imaging
    Jiaxing Research Institute Zhejiang University)

Abstract

Two-dimensional single crystal metals, in which the behavior of highly confined optical modes is intertwined with quantum phenomena, are highly sought after for next-generation technologies. Here, we report large area (>104 μm2), single crystal two-dimensional gold flakes (2DGFs) with thicknesses down to a single nanometer level, employing an atomic-level precision chemical etching approach. The decrease of the thickness down to such scales leads to the quantization of the electronic states, endowing 2DGFs with quantum-confinement-augmented optical nonlinearity, particularly leading to more than two orders of magnitude enhancement in harmonic generation compared with their thick polycrystalline counterparts. The nanometer-scale thickness and single crystal quality makes 2DGFs a promising platform for realizing plasmonic nanostructures with nanoscale optical confinement. This is demonstrated by patterning 2DGFs into nanoribbon arrays, exhibiting strongly confined near infrared plasmonic resonances with high quality factors. The developed 2DGFs provide an emerging platform for nanophotonic research and open up opportunities for applications in ultrathin plasmonic, optoelectronic and quantum devices.

Suggested Citation

  • Chenxinyu Pan & Yuanbiao Tong & Haoliang Qian & Alexey V. Krasavin & Jialin Li & Jiajie Zhu & Yiyun Zhang & Bowen Cui & Zhiyong Li & Chenming Wu & Lufang Liu & Linjun Li & Xin Guo & Anatoly V. Zayats , 2024. "Large area single crystal gold of single nanometer thickness for nanophotonics," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
  • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-47133-7
    DOI: 10.1038/s41467-024-47133-7
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    References listed on IDEAS

    as
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