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On-chip Cherenkov radiation tuning in 3.2-14 THz

Author

Listed:
  • Tianchang Li

    (Tsinghua University)

  • Fang Liu

    (Tsinghua University)

  • Yudi Chen

    (Tsinghua University)

  • Xiaotong Xiong

    (Tsinghua University)

  • Kaiyu Cui

    (Tsinghua University)

  • Xue Feng

    (Tsinghua University)

  • Wei Zhang

    (Tsinghua University)

  • Yidong Huang

    (Tsinghua University)

Abstract

Cherenkov radiation has attracted much attention for promoting the free electron radiation sources. Using hyperbolic metamaterial, Cherenkov radiation can be excited using low-energy electrons and thus on-chip free electron radiation source has been realized. However, direct experimental observations of on-chip free-electron-based Cherenkov radiation have been limited to the visible region, and the tunability has not been thoroughly explored. In this work, by constructing a hyperbolic metamaterial with graphene and hexagonal boron nitride, on-chip, free-electron-based terahertz Cherenkov radiation is observed and the frequency tunable range spans 3.2 to 14 THz in a hundred-micron-scale dimension. Compared with other free-electron terahertz sources, the chip size is over three orders of magnitude smaller, and the tunable range is one of the widest. This work extends the on-chip free-electron-based Cherenkov radiation into terahertz domain, highlighting its tunability and paves the way for further advancements in free electron radiation source.

Suggested Citation

  • Tianchang Li & Fang Liu & Yudi Chen & Xiaotong Xiong & Kaiyu Cui & Xue Feng & Wei Zhang & Yidong Huang, 2025. "On-chip Cherenkov radiation tuning in 3.2-14 THz," Nature Communications, Nature, vol. 16(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-63368-4
    DOI: 10.1038/s41467-025-63368-4
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