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Revealing low-loss dielectric near-field modes of hexagonal boron nitride by photoemission electron microscopy

Author

Listed:
  • Yaolong Li

    (Peking University)

  • Pengzuo Jiang

    (Peking University)

  • Xiaying Lyu

    (Peking University)

  • Xiaofang Li

    (Peking University)

  • Huixin Qi

    (Peking University)

  • Jinglin Tang

    (Peking University)

  • Zhaohang Xue

    (Peking University)

  • Hong Yang

    (Peking University
    Peking University Yangtze Delta Institute of Optoelectronics
    Shanxi University)

  • Guowei Lu

    (Peking University
    Peking University Yangtze Delta Institute of Optoelectronics
    Shanxi University)

  • Quan Sun

    (Peking University Yangtze Delta Institute of Optoelectronics)

  • Xiaoyong Hu

    (Peking University
    Peking University Yangtze Delta Institute of Optoelectronics
    Shanxi University)

  • Yunan Gao

    (Peking University
    Peking University Yangtze Delta Institute of Optoelectronics
    Shanxi University)

  • Qihuang Gong

    (Peking University
    Peking University Yangtze Delta Institute of Optoelectronics
    Shanxi University)

Abstract

Low-loss dielectric modes are important features and functional bases of fundamental optical components in on-chip optical devices. However, dielectric near-field modes are challenging to reveal with high spatiotemporal resolution and fast direct imaging. Herein, we present a method to address this issue by applying time-resolved photoemission electron microscopy to a low-dimensional wide-bandgap semiconductor, hexagonal boron nitride (hBN). Taking a low-loss dielectric planar waveguide as a fundamental structure, static vector near-field vortices with different topological charges and the spatiotemporal evolution of waveguide modes are directly revealed. With the lowest-order vortex structure, strong nanofocusing in real space is realized, while near-vertical photoemission in momentum space and narrow spread in energy space are simultaneously observed due to the atomically flat surface of hBN and the small photoemission horizon set by the limited photon energies. Our approach provides a strategy for the realization of flat photoemission emitters.

Suggested Citation

  • Yaolong Li & Pengzuo Jiang & Xiaying Lyu & Xiaofang Li & Huixin Qi & Jinglin Tang & Zhaohang Xue & Hong Yang & Guowei Lu & Quan Sun & Xiaoyong Hu & Yunan Gao & Qihuang Gong, 2023. "Revealing low-loss dielectric near-field modes of hexagonal boron nitride by photoemission electron microscopy," Nature Communications, Nature, vol. 14(1), pages 1-7, December.
  • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-40603-4
    DOI: 10.1038/s41467-023-40603-4
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    References listed on IDEAS

    as
    1. Yanan Dai & Zhikang Zhou & Atreyie Ghosh & Roger S. K. Mong & Atsushi Kubo & Chen-Bin Huang & Hrvoje Petek, 2020. "Plasmonic topological quasiparticle on the nanometre and femtosecond scales," Nature, Nature, vol. 588(7839), pages 616-619, December.
    2. Caiyun Hong & Wenjun Zou & Pengxu Ran & K. Tanaka & M. Matzelle & Wei-Chi Chiu & R. S. Markiewicz & B. Barbiellini & Changxi Zheng & Sheng Li & Arun Bansil & Rui-Hua He, 2023. "Anomalous intense coherent secondary photoemission from a perovskite oxide," Nature, Nature, vol. 617(7961), pages 493-498, May.
    3. Sejeong Kim & Johannes E. Fröch & Joe Christian & Marcus Straw & James Bishop & Daniel Totonjian & Kenji Watanabe & Takashi Taniguchi & Milos Toth & Igor Aharonovich, 2018. "Photonic crystal cavities from hexagonal boron nitride," Nature Communications, Nature, vol. 9(1), pages 1-8, December.
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