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Apodized waveguide arrays induced by photorefractive nonlinear surface waves.

P F Qi, Z J Hu, R Han

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    |December 25, 2015
    PubMed
    Summary

    Researchers introduce novel nonlinear waveguides, called photorefractive surface apodized waveguide arrays, formed by surface waves in photorefractive crystals. These arrays exhibit unique mode coupling and mini-gaps due to intertwined dispersion curves.

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    Area of Science:

    • Nonlinear optics
    • Condensed matter physics
    • Materials science

    Background:

    • Photorefractive materials enable light-induced refractive index changes.
    • Surface waves can confine optical fields at material interfaces.
    • Waveguide arrays are crucial for integrated optics and light manipulation.

    Purpose of the Study:

    • To propose and analyze a new class of nonlinear optical waveguides: photorefractive surface apodized waveguide arrays.
    • To investigate the optical properties and mode behavior within these novel waveguide structures.
    • To explore the unique dispersion characteristics and mode coupling phenomena.

    Main Methods:

    • Theoretical analysis of the refractive index distribution.
    • Derivation and analysis of the dispersion relation for the waveguide array.
    • Numerical modeling of optical modes and their properties.

    Main Results:

    • Photorefractive surface apodized waveguide arrays are demonstrated, characterized by periodic refractive index modulation with an apodized envelope.
    • Coupling and intertwining of dispersion curves for index-guided and Bragg-guided modes are observed.
    • Anti-crossings between mode dispersion curves lead to the formation of mini-gaps.
    • A new type of extraordinary mode, formed by splicing index-guided and Bragg-guided modes, is identified.

    Conclusions:

    • The proposed photorefractive surface apodized waveguide arrays offer a novel platform for nonlinear optical applications.
    • The unique mode coupling and mini-gap phenomena provide opportunities for advanced optical control and signal processing.
    • The existence of extraordinary modes suggests new possibilities for light propagation in engineered optical structures.