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Related Experiment Video

Updated: Mar 12, 2026

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
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Fabrication-friendly subwavelength-structure-assisted waveguide for dispersion engineering.

Zeinab Jafari, Abbas Zarifkar

    Applied Optics
    |November 19, 2016
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a novel subwavelength structure for silicon waveguides, enabling precise dispersion engineering. The design allows tailored refractive index control for optimized linear and nonlinear optical applications.

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    Area of Science:

    • Photonics and Optical Engineering
    • Materials Science

    Background:

    • Dispersion engineering is crucial for optical applications, but material compatibility and refractive index limitations pose challenges.
    • Subwavelength structures offer a potential solution for tailoring optical properties.

    Purpose of the Study:

    • To present a novel subwavelength structure for dispersion engineering in silicon waveguides.
    • To demonstrate the ability to engineer the equivalent refractive index and control dispersion characteristics.

    Main Methods:

    • A subwavelength structure was deposited on a silicon strip waveguide.
    • The period and duty cycle of the subwavelength structure were adjusted to tailor the equivalent refractive index.
    • The impact on the fundamental quasi-TM mode and dispersion was analyzed.

    Main Results:

    • The subwavelength structure allows for precise refractive index engineering, overcoming material limitations.
    • A wide and flattened low-dispersion bandwidth was achieved.
    • High anomalous and normal dispersion were realized without compromising dispersion flatness.

    Conclusions:

    • The proposed waveguide structure offers a versatile platform for dispersion tailoring.
    • This approach is promising for both linear and nonlinear optical applications.
    • The method bypasses material compatibility issues inherent in traditional dispersion engineering.