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Directly coupled low reflection loss valley topology defect cavity.

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    We introduce a topological defect cavity (TDC) for photonic crystals, minimizing reflection loss in on-chip devices. This novel design enables efficient light transmission and flexible resonant frequency tuning for integrated photonics.

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    Area of Science:

    • Photonics
    • Condensed Matter Physics
    • Nanotechnology

    Background:

    • Defect cavities are crucial for light manipulation in photonic devices.
    • Integrating conventional defect cavities into waveguides causes significant reflection loss and energy dissipation.
    • Existing methods struggle with efficient on-chip light transmission.

    Purpose of the Study:

    • To propose a novel topological defect cavity (TDC) design for photonic crystals.
    • To overcome reflection loss issues in conventional defect cavity waveguides.
    • To create a versatile platform for on-chip functional devices.

    Main Methods:

    • Incorporating topological concepts into defect cavity design.
    • Utilizing valley photonic crystals for TDC construction.
    • Coupling the TDC with topological waveguides.

    Main Results:

    • Achieved low reflection loss transmission under non-resonant conditions.
    • Enabled flexible tuning of the cavity's resonant frequency.
    • Demonstrated a multifunctional logic device combining TDC and a power splitter.

    Conclusions:

    • The TDC-topological waveguide system offers a promising solution for efficient on-chip light transmission.
    • The TDC platform facilitates the design of advanced integrated photonic devices.
    • This work has potential applications in integrated micro-nano photonics.