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    Researchers developed novel bound valley edge states in the continuum for manipulating light. These topological states offer unidirectional propagation and disorder immunity in smaller photonic structures.

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    Area of Science:

    • Photonics
    • Condensed Matter Physics
    • Topological Materials

    Background:

    • Topological valley photonics manipulates light flow using valley edge states.
    • Valley edge states offer unidirectional propagation and robustness against defects.
    • Typically, these states form at interfaces between valley photonic crystals with opposite Chern numbers.

    Purpose of the Study:

    • To propose and demonstrate a new type of edge state: bound valley edge states in the continuum.
    • To achieve topological features at the interface between a single valley photonic crystal and air.
    • To reduce the size of topological photonic devices.

    Main Methods:

    • Numerical demonstration of bound valley edge states in the continuum.
    • Merging the physics of valley edge states and bound states in the continuum.
    • Utilizing a single valley photonic crystal interfaced with air.

    Main Results:

    • Successfully demonstrated bound valley edge states in the continuum.
    • These states exhibit unidirectional propagation and immunity to disorders.
    • The proposed concept allows for smaller topological photonic structures.

    Conclusions:

    • Introduced bound valley edge states in the continuum, a novel topological edge state.
    • These states combine topological protection with formation at a single crystal-air interface.
    • Potential applications include optical sensing and unidirectional waveguiding.