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Second-harmonic-generation-induced optical bistability in prism or grating couplers.

R Reinisch, E Popov, M Nevière

    Optics Letters
    |October 28, 2009
    PubMed
    Summary

    We theoretically demonstrate optical bistability in nonlinear-optical resonators using second-harmonic generation. This study is the first to show this effect in chi((2)) optical resonators with prism or grating couplers.

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    Area of Science:

    • Nonlinear Optics
    • Optical Resonators
    • Photonics

    Background:

    • Second-harmonic generation (SHG) is a key process in nonlinear optics.
    • chi((2)) nonlinear-optical resonators, like prism and grating couplers, are crucial for optical signal processing.
    • Understanding SHG dynamics in these resonators is essential for developing advanced photonic devices.

    Purpose of the Study:

    • To theoretically investigate second-harmonic generation in chi((2)) nonlinear-optical resonators.
    • To explore the potential for optical bistability in such systems.
    • To present a novel theoretical framework for analyzing SHG in coupled-mode systems.

    Main Methods:

    • Utilizing a recently developed coupled-mode analysis.
    • Deriving a set of equations to govern the amplitudes of pump and second-harmonic frequency fields.

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  • Performing analytical predictions based on the derived theoretical model.

    • Main Results:

    • Analytical prediction of optical bistability in second-harmonic generation.
    • Demonstration that prism and grating couplers can exhibit this bistable behavior.
    • Identification of a new phenomenon in chi((2)) optical resonators.

    Conclusions:

    • Second-harmonic generation in chi((2)) nonlinear-optical resonators can lead to optical bistability.
    • This work presents the first theoretical demonstration of optical bistability in these specific resonator types.
    • The findings open new avenues for designing optical switches and memory elements.