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Tunable beam manipulation based on phase-change metasurfaces.

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    This study introduces a novel metasurface using germanium antimony telluride (GST) to control light polarization and phase. This technology enables switchable optical devices for applications in reconfigurable systems and secure communications.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Nanotechnology

    Background:

    • Metasurfaces offer advanced control over light properties.
    • Phase-change materials like GST provide tunable optical responses.
    • Spin-orbit interactions (SOIs) are crucial for manipulating light polarization and phase.

    Purpose of the Study:

    • To design a switchable wave plate using a GST-integrated metasurface.
    • To simultaneously manipulate the polarization and phase of reflected light.
    • To develop reconfigurable optical devices for advanced applications.

    Main Methods:

    • Integration of a phase-change material, germanium antimony telluride (GST), with a metasurface.
    • Designing a converter functioning as a quarter- or three-quarter-wave plate based on GST's amorphous or crystalline state.
    • Designing a switch acting as a mirror or half-wave plate, controlled by GST's state.

    Main Results:

    • Demonstrated a convertible vectorial beams converter generating radial or azimuthal polarization.
    • Achieved a switchable vortex beam generator with tunable orbital angular momentum (topological charge l=±2).
    • Simultaneous manipulation of polarization and phase of reflected light was realized.

    Conclusions:

    • The designed GST-based metasurface enables efficient and reconfigurable control of light polarization and phase.
    • This technology presents a promising pathway for high-efficiency reconfigurable devices.
    • Potential applications include encrypted optical communications and advanced optical signal processing.