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    Researchers developed new bound states in the continuum (BICs) slow light waveguides for photonic integrated circuits. These waveguides operate at off-high symmetry points, enabling low loss and high group index for advanced light control.

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    Area of Science:

    • Photonics
    • Integrated Optics
    • Materials Science

    Background:

    • Bound states in the continuum (BICs) offer low-loss light guiding in leaky environments.
    • Existing BIC waveguides were limited to high symmetry points, restricting applications.
    • Etchless waveguides using dielectric wires on slabs enable BIC confinement for TM modes.

    Purpose of the Study:

    • To propose and demonstrate BIC slow light waveguides at off-high symmetry points.
    • To overcome the limitations of previous BIC waveguide designs.
    • To enable advanced control of light in photonic integrated circuits.

    Main Methods:

    • Utilizing Friedrich-Wintgen BICs derived from interband coupling of guided modes.
    • Introducing one-dimensional photonic crystals into etchless waveguides.
    • Numerical demonstration and analysis of waveguide performance.

    Main Results:

    • Achieved BIC slow light waveguides at off-high symmetry points.
    • Demonstrated a high group index exceeding 100.
    • Obtained low propagation loss below 5.0×10⁻² dB/cm.
    • Identified a systematic method for tuning loss minimum in momentum space.

    Conclusions:

    • The proposed waveguides offer enhanced control over light propagation.
    • This work expands the applicability of BIC waveguides beyond high symmetry points.
    • Findings facilitate advanced light-matter interactions in non-Hermitian photonic systems.