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Coupled micro-resonators for second-order integrated nonlinear optics.

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    Summary
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    We achieved simultaneous double resonance and phase-matching in coupled optical micro-resonators. This enables efficient second harmonic generation in III-V microdisks.

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    Area of Science:

    • Photonics and optical engineering.
    • Nonlinear optics.
    • Materials science.

    Background:

    • Coupled optical micro-resonators offer unique light-matter interaction possibilities.
    • Achieving simultaneous resonance and phase-matching is crucial for efficient nonlinear optical processes.
    • Whispering gallery mode microdisks are promising platforms for integrated photonics.

    Purpose of the Study:

    • To investigate second-order nonlinear optical processes in coupled identical optical micro-resonators.
    • To demonstrate simultaneous achievement of double resonance and phase-matching conditions.
    • To apply coupled mode theory to second harmonic generation in III-V microdisks.

    Main Methods:

    • Theoretical analysis using coupled mode theory.
    • Modeling of two coupled identical optical micro-resonators.
    • Investigation of frequency splitting induced by resonator coupling.
    • Application to second harmonic generation in whispering gallery mode microdisks.

    Main Results:

    • Simultaneous double resonance and phase-matching conditions were obtained.
    • Frequency splitting due to resonator coupling facilitates these conditions.
    • The framework is applied to second harmonic generation in III-V microdisks.

    Conclusions:

    • Coupled micro-resonators provide a viable platform for enhanced nonlinear optical processes.
    • The demonstrated conditions are key for efficient frequency conversion.
    • This work contributes to the development of integrated photonic devices for nonlinear applications.