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Grating-assisted phase-matched second-harmonic generation from a polymer waveguide.

G Blau, E Popov, F Kajzar

    Optics Letters
    |October 28, 2009
    PubMed
    Summary
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    Diffraction gratings enable phase matching in waveguides. Researchers observed grating-assisted phase-matched second-harmonic generation between counterpropagating TM(0) modes in an organic waveguide using the third spatial harmonic.

    Area of Science:

    • Nonlinear optics
    • Integrated photonics
    • Waveguide technology

    Background:

    • Phase matching is crucial for efficient nonlinear optical processes in waveguides.
    • Traditional methods like quasi-phase matching and Cerenkov configurations have limitations.
    • Diffraction gratings offer an alternative approach for achieving phase matching.

    Purpose of the Study:

    • To demonstrate a novel method for phase matching in waveguides using diffraction gratings.
    • To achieve phase-matched second-harmonic generation (SHG) in an organic waveguide.
    • To investigate the use of spatial harmonics generated by a grating for phase matching.

    Main Methods:

    • Utilizing a corrugated diffraction grating to couple fundamental modes.
    • Generating spatial harmonics of the guided electromagnetic field.

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  • Employing the third spatial harmonic for phase matching.
  • Experimentally demonstrating second-harmonic generation between counterpropagating TM(0) modes.

    • Main Results:

    • Successfully achieved phase matching using a diffraction grating.
    • Observed grating-assisted phase-matched second-harmonic generation.
    • Demonstrated SHG between counterpropagating TM(0) modes in an organic waveguide.
    • Reported the first observation of this specific type of phase-matched SHG.

    Conclusions:

    • Diffraction gratings are effective for achieving phase matching in waveguides.
    • The grating acts as a simultaneous coupler for pump and harmonic frequencies.
    • This method provides a new route for efficient nonlinear frequency conversion in integrated photonic devices.