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Enhancing spoof surface-plasmons with gradient metasurfaces.

Ling-Bao Kong1, Cheng-Ping Huang2, Chao-Hai Du1

  • 1School of Electronics Engineering and Computer Science, Peking University, Beijing 100871, P.R. China.

Scientific Reports
|March 6, 2015
PubMed
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Researchers enhanced the coupling between plasmonic fields and relativistic electrons using gradient metasurfaces to support spoof surface-plasmons (SSPs). This method achieves quasi-velocity-matching, enabling efficient energy transfer for potential new terahertz (THz) wave sources.

Area of Science:

  • Physics
  • Materials Science
  • Engineering

Background:

  • Surface plasmons and free electrons can amplify waves or accelerate particles.
  • Weak interactions due to short lengths or velocity mismatches limit current applications.
  • Enhancing plasmon-electron coupling is crucial for advanced wave-particle interactions.

Purpose of the Study:

  • To propose a novel mechanism for enhancing the coupling between plasmonic fields and relativistic electrons.
  • To investigate the use of gradient metasurfaces supporting spoof surface-plasmons (SSPs) for this purpose.
  • To achieve quasi-velocity-matching between SSPs and electrons.

Main Methods:

  • Utilizing a weakly gradient metasurface to support spoof surface-plasmons (SSPs).
  • Manipulating the phase velocity of SSPs to approach velocity-matching conditions with relativistic electrons.

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  • Employing dynamic coupling equations and particle-in-cell simulations to analyze the interaction.

    • Main Results:

    • Demonstrated sustained increase of SSPs in a narrow frequency band.
    • Achieved significant energy extraction from relativistic electrons due to strong coupling.
    • Obtained 65 W output power at 1 THz with a 28 mm interaction length.
    • Enhanced coupling efficiency by two orders of magnitude.

    Conclusions:

    • The proposed mechanism effectively enhances plasmon-electron coupling.
    • Quasi-velocity-matching is achievable using gradient metasurfaces and SSPs.
    • The findings pave the way for designing compact and efficient terahertz (THz) wave sources.