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    We developed a new integrated photonic delay line using extreme skin-depth (eskid) waveguides. This technology significantly reduces chip size, enabling higher density for optical signal processing and ultrashort pulse control.

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    Area of Science:

    • Photonics
    • Integrated Optics
    • Waveguide Technology

    Background:

    • Optical delay lines are crucial for controlling light in time for applications like interference engineering and ultrashort pulse manipulation.
    • Current photonic delay lines, often using spiral waveguides, occupy large chip areas (mm² to cm²), limiting integration density.
    • Photonic integration is key for on-chip lightwave signal processing and pulse control.

    Purpose of the Study:

    • To present a novel, scalable, and high-density integrated optical delay line.
    • To demonstrate the effectiveness of extreme skin-depth (eskid) waveguides for reducing footprint and crosstalk.
    • To enable denser integration of photonic circuits for advanced optical functions.

    Main Methods:

    • Utilized a skin-depth engineered subwavelength grating waveguide, termed extreme skin-depth (eskid) waveguide.
    • Designed and fabricated integrated photonic delay lines based on the eskid waveguide architecture.
    • Investigated the crosstalk suppression capabilities of closely spaced eskid waveguides.

    Main Results:

    • The eskid waveguide effectively suppresses crosstalk between adjacent waveguides.
    • This suppression allows for significantly closer waveguide spacing, reducing overall chip footprint.
    • The proposed delay line design is scalable by adjusting the number of waveguide turns.

    Conclusions:

    • The eskid waveguide offers a pathway to highly dense photonic integrated circuits.
    • This technology can lead to substantial reductions in the physical size of optical delay lines.
    • The developed delay line is suitable for scalable photonic chip integration, advancing lightwave signal processing.