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Rejection of Fluorescence Background in Resonance and Spontaneous Raman Microspectroscopy
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Nonlinear directional coupler with a diffusive Kerr-type nonlinearity.

D R Heatley, E M Wright, J Ehrlich

    Optics Letters
    |September 12, 2009
    PubMed
    Summary
    This summary is machine-generated.

    Switching in nonlinear directional couplers is possible despite diffusion, but higher thresholds and less pronounced switching occur when diffusion length equals waveguide separation.

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    Area of Science:

    • Nonlinear optics
    • Waveguide optics
    • Optical switching

    Background:

    • Nonlinear directional couplers are key components in optical switching.
    • Kerr nonlinearity influences light propagation in waveguides.
    • Diffusive nonlinearity adds complexity to light-matter interactions.

    Purpose of the Study:

    • To investigate the impact of diffusive Kerr-type nonlinearity on nonlinear directional coupler switching.
    • To analyze how diffusion length affects switching characteristics.

    Main Methods:

    • Numerical simulations were employed.
    • The study focused on the interplay between nonlinearity, diffusion, and waveguide geometry.

    Main Results:

    • Switching in the nonlinear directional coupler persists even when the diffusion length matches the waveguide separation.
    • However, this condition leads to an increased switching threshold.
    • The switching behavior becomes less pronounced under these conditions.

    Conclusions:

    • Diffusive Kerr nonlinearity significantly modifies optical switching dynamics.
    • Waveguide separation and diffusion length are critical parameters influencing switching efficiency and threshold.