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Area of Science:

  • Photonics and Optical Engineering
  • Materials Science
  • Nonlinear Optics

Background:

  • Coherent frequency generators are crucial for science and technology.
  • Microcavity-based frequency comb generation relies on Kerr parametric oscillations.
  • Existing methods face limitations due to competing nonlinearities and low material Kerr coefficients.

Purpose of the Study:

  • To develop a novel strategy for fabricating near-infrared (NIR) frequency combs.
  • To overcome the limitations of current microcavity-based comb generation.
  • To enhance parametric oscillation efficiency in high-Q microcavities.

Main Methods:

  • Fabrication of ultrahigh-Q microcavities.
  • Functionalization of microcavities with monomolecular layers of highly nonlinear small molecules.
  • Characterization of parametric oscillation and frequency comb generation thresholds.

Main Results:

  • Demonstrated high-efficiency parametric oscillation in functionalized near-IR microcavities.
  • Achieved primary frequency combs with a low threshold of 0.88 mW.
  • Improved optical parametric oscillation generation by three orders of magnitude compared to non-functionalized devices.

Conclusions:

  • The organic-inorganic approach significantly reduces the frequency comb generation threshold.
  • This method enables previously unattainable performance in microcavity-based frequency generation.
  • The findings pave the way for next-generation integrated photonic devices.