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    This study introduces reconfigurable meta-devices for active wave manipulation. Using catenary meta-atoms and phase change materials, researchers achieved efficient, tunable wavefront control for beam steering and Bessel beam generation.

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    Area of Science:

    • Photonics
    • Metamaterials
    • Wave Manipulation

    Background:

    • Current ultracompact meta-devices lack functional reconfigurability.
    • Discrete meta-atoms introduce phase/amplitude discontinuities, limiting practical applications.

    Purpose of the Study:

    • To demonstrate actively tunable wavefront control with high efficiency.
    • To overcome limitations of current meta-devices by enabling continuous phase regulation.

    Main Methods:

    • Combining catenary-based meta-atoms for continuous phase regulation.
    • Utilizing the chalcogenide phase change material (PCM) Ge2Sb2Te5 for active tuning.
    • Demonstrating switchable beam deflection and meta-axicon functionalities.

    Main Results:

    • Achieved switchable beam deflection in the mid-IR range (8-9.5 μm) between anomalous and normal specular reflections.
    • Demonstrated a switchable meta-axicon for zero-order Bessel beam generation with a narrow FWHM of ~0.41 λ.
    • Showcased high-efficiency active wavefront control with a large contrast ratio.

    Conclusions:

    • The proposed scheme enables active and continuous phase control for meta-devices.
    • This approach paves the way for advanced active photonic devices.
    • Potential applications include optoelectronic integration and wavefront engineering.