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Nonlinear frequency conversion in waveguide directional couplers.

Po Dong1, Andrew G Kirk

  • 1Photonic Systems Group, Department of Electrical and Computer Engineering, McGill University, 3480 University Street, Montreal, QC, H3A 2A7, Canada. podong@photonics.ece.mcgill.ca

Physical Review Letters
|November 5, 2004
PubMed
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Phase matching for nonlinear frequency conversion can be replaced by a resonance condition in waveguide directional couplers. This enables theoretical 100% conversion efficiency for second-harmonic generation, matching perfect phase matching.

Area of Science:

  • Nonlinear optics
  • Integrated photonics
  • Waveguide technology

Background:

  • Nonlinear optical effects are crucial for frequency conversion.
  • Efficient frequency conversion relies on achieving a phase-matching condition.
  • Phase matching ensures coherent field generation at the desired wavelength.

Purpose of the Study:

  • To explore an alternative to phase matching for nonlinear frequency conversion.
  • To investigate the use of resonance conditions in waveguide directional couplers.
  • To theoretically demonstrate 100% conversion efficiency for second-harmonic generation.

Main Methods:

  • Theoretical analysis of nonlinear effects in waveguide directional couplers.
  • Application of resonance conditions to second-harmonic generation.

Related Experiment Videos

  • Design and simulation of a waveguide directional coupler for efficient frequency conversion.

    • Main Results:

    • The phase-matching condition can be substituted by a resonance condition.
    • A theoretical conversion efficiency of 100% was achieved for second-harmonic generation.
    • The results are equivalent to those obtained with perfect phase matching.

    Conclusions:

    • Resonance conditions offer a viable alternative to phase matching in waveguide directional couplers.
    • Waveguide directional couplers can achieve highly efficient nonlinear frequency conversion.
    • The proposed design provides a pathway for practical implementation.