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Dispersion engineering of a microsphere via multi-layer coating.

Xueying Jin, Jing Wang, Mengyu Wang

    Applied Optics
    |October 20, 2017
    PubMed
    Summary
    This summary is machine-generated.

    Dispersion in whispering gallery mode resonators is controllable using a three-layer coating. This method allows for broad engineering of normal and anomalous dispersion regimes for nonlinear optical applications.

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    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Whispering gallery mode resonators are crucial for nonlinear optical applications.
    • Precise control over optical dispersion is essential for optimizing these applications.

    Purpose of the Study:

    • To demonstrate strong dispersion engineering in a three-layer-coated microsphere.
    • To investigate the tunability of group-velocity dispersion (GVD) by varying coating parameters.

    Main Methods:

    • Numerical and theoretical modeling of a three-layer-coated microsphere.
    • Analysis of the influence of coating thickness, gap, surrounding medium, and materials on GVD.

    Main Results:

    • Achieved strong dispersion control in both normal and anomalous regimes.
    • Demonstrated tunability of GVD through structural and material parameters.
    • Identified a three-layer coating structure (high, low, high refractive indices) as effective for dispersion engineering.

    Conclusions:

    • The proposed three-layer coating approach offers significant flexibility for dispersion engineering in axisymmetric resonators.
    • This method is applicable to various nonlinear optical devices, including frequency combs and lasers.
    • Enables tailored dispersion for enhanced performance in ultrafast optics and other applications.