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On-chip Cherenkov radiation tuning in 3.2-14 THz.

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Researchers achieved tunable terahertz Cherenkov radiation using on-chip hyperbolic metamaterials made of graphene and hexagonal boron nitride. This breakthrough enables compact, tunable free-electron radiation sources in the terahertz domain.

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Area of Science:

  • Physics
  • Materials Science
  • Nanotechnology

Background:

  • Cherenkov radiation is crucial for free electron radiation sources.
  • On-chip free electron radiation sources have been limited to visible light and lacked tunability.
  • Hyperbolic metamaterials enable Cherenkov radiation with low-energy electrons.

Purpose of the Study:

  • To experimentally observe on-chip, free-electron-based Cherenkov radiation in the terahertz domain.
  • To explore the frequency tunability of this terahertz Cherenkov radiation.
  • To develop a compact and tunable terahertz free electron radiation source.

Main Methods:

  • Fabrication of a hyperbolic metamaterial using graphene and hexagonal boron nitride.
  • Excitation of Cherenkov radiation using low-energy electrons.
  • Characterization of the emitted radiation's frequency and tunability.

Main Results:

  • Successful observation of on-chip, free-electron-based terahertz Cherenkov radiation.
  • Demonstration of a wide frequency tunable range from 3.2 to 14 THz.
  • Achieved a hundred-micron-scale chip size, over three orders of magnitude smaller than other terahertz sources.

Conclusions:

  • This work extends on-chip free-electron-based Cherenkov radiation to the terahertz spectrum.
  • The developed device offers a highly tunable and compact terahertz radiation source.
  • Highlights potential for advancements in compact free electron radiation sources.