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Researchers achieved third harmonic generation at 9.63 THz using graphene and a quantum cascade laser (QCL). This breakthrough enables access to a challenging terahertz (THz) frequency range for compact optical sources.

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Nonlinear Optics

Background:

  • Harmonic generation is crucial for frequency conversion in optics.
  • Graphene's nonlinear optical properties are promising for harmonic generation.
  • Previous graphene-based harmonic generation was limited to frequencies below 2 THz.

Purpose of the Study:

  • To demonstrate third harmonic generation (THG) at a higher frequency (9.63 THz) using graphene.
  • To explore the use of a quantum cascade laser (QCL) for THG in graphene.
  • To overcome limitations in accessing THz frequencies due to semiconductor properties.

Main Methods:

  • Optically pumping single-layer graphene coupled to a circular split ring resonator (CSRR) array.
  • Utilizing a 3.21 THz frequency quantum cascade laser (QCL) as the pump source.
  • Leveraging the enhanced power density from CSRR mode confinement.

Main Results:

  • Successfully demonstrated third harmonic generation (THG) at 9.63 THz.
  • Observed enhanced pump and harmonic power densities due to CSRR confinement.
  • Achieved THG in a frequency range (6-12 THz) difficult for conventional sources.

Conclusions:

  • Graphene coupled with CSRRs enables efficient THG at higher THz frequencies.
  • This approach provides a pathway to compact sources in the 6-12 THz range.
  • Overcomes limitations imposed by the Reststrahlenband of III-V semiconductors.