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Plasmon enhanced terahertz emission from single layer graphene.

Young-Mi Bahk1, Gopakumar Ramakrishnan, Jongho Choi

  • 1Center for Subwavelength Optics and Department of Physics and Astronomy, Seoul National University , Seoul 151-747, Korea.

ACS Nano
|August 20, 2014
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Summary

Surface plasmons significantly boost terahertz pulse generation from graphene. This research paves the way for developing compact and efficient terahertz photonic devices.

Keywords:
gold nanostructuresgraphenesurface plasmonterahertz spectroscopyultrafast photon drag

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Condensed Matter Physics

Background:

  • Single-layer graphene exhibits unique electronic properties suitable for optoelectronic applications.
  • Terahertz (THz) pulse generation is crucial for various spectroscopic and imaging techniques.
  • Surface plasmons offer a pathway to enhance light-matter interactions at the nanoscale.

Purpose of the Study:

  • To investigate the enhancement of ultrashort, broadband terahertz pulse generation from single-layer graphene using surface plasmons.
  • To elucidate the underlying mechanisms responsible for terahertz emission from graphene on different gold substrates.
  • To explore the potential for developing advanced terahertz photonic devices.

Main Methods:

  • Excitation of surface plasmons on continuous and discontinuous gold substrates using femtosecond laser pulses.
  • Analysis of terahertz pulse generation and polarization from single-layer graphene.
  • Comparison of terahertz emission with and without surface plasmon excitation.

Main Results:

  • Surface plasmons strongly enhance the generation and emission of terahertz pulses from graphene.
  • Nonresonant laser-pulse-induced photon drag currents are responsible for weak terahertz emission from graphene on glass.
  • Surface-plasmon-enhanced optical rectification significantly boosts p-polarized terahertz emission from graphene on discontinuous gold substrates.

Conclusions:

  • Surface plasmon excitation is a highly effective method for enhancing terahertz pulse generation in graphene.
  • The findings suggest a new mechanism for terahertz generation involving surface plasmon interactions with graphene's asymmetric structure.
  • This work provides a foundation for the development of smaller, more efficient terahertz photonic devices.