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    Researchers developed a new laser-based method for creating tunable metasurfaces, enabling flexible manufacturing. This technique offers advanced control over electromagnetic waves for stealth applications.

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    Area of Science:

    • Metamaterials and Nanophotonics
    • Electromagnetics and Wave Theory

    Background:

    • Tunable metasurfaces offer precise electromagnetic wave control but often rely on electrical methods, hindering large-scale fabrication.
    • Current electrical tuning methods present challenges for rapid, reversible, and conformal manufacturing of metasurfaces.

    Purpose of the Study:

    • To investigate the impact of laser tilting induction technology on the phase transition of Germanium Telluride (GeTe) film.
    • To propose a novel phase-amplitude composite electromagnetic stealth control method utilizing GeTe's distinct properties before and after laser-induced phase transition.

    Main Methods:

    • Systematic study of laser tilting induction's effect on GeTe film phase transition.
    • Design and analysis of resonant unit phase characteristics and electromagnetic scattering for various array arrangements.
    • Analysis of low-reflection performance for curved metasurfaces under oblique incidence.

    Main Results:

    • Demonstrated independent phase and amplitude control capabilities in curved metasurfaces.
    • Achieved reflectivity below -10 dB across specific frequency bands (8.9-14.8 GHz and 6.1-10.5 GHz) before and after phase transition.
    • Confirmed high stability within 40 degrees of oblique incidence.

    Conclusions:

    • Laser tilting induction offers a viable, flexible method for tunable metasurface fabrication.
    • The proposed GeTe-based method provides effective electromagnetic stealth control with advantages in design and manufacturing.
    • Potential applications include military stealth materials, conformal electromagnetic windows, and beam shapers.