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Feature issue introduction: temporal and spatiotemporal metamaterials.

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    Modulating material properties over time unlocks new possibilities for metamaterials and wave interactions. This dynamic approach breaks time reversal symmetry, enabling novel physical effects and applications in advanced wave propagation.

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    Area of Science:

    • Physics
    • Materials Science
    • Electromagnetics

    Background:

    • Metamaterials and metasurfaces offer unique wave manipulation capabilities.
    • Controlling material properties over time introduces a new dimension for wave-matter interactions.
    • Existing research focuses on static material properties, limiting dynamic control.

    Purpose of the Study:

    • To explore the implications of temporal modulation of material parameters.
    • To investigate novel physical effects arising from time-varying media.
    • To expand the understanding of wave propagation in dynamic spatiotemporal platforms.

    Main Methods:

    • Theoretical analysis of wave propagation in time-varying media.
    • Experimental investigations of dynamic metamaterial responses.
    • Mathematical modeling of electromagnetic energy dynamics and symmetry breaking.

    Main Results:

    • Demonstrated non-conservation of electromagnetic energy in time-varying media.
    • Observed breaking of time reversal symmetry.
    • Identified novel wave phenomena unique to dynamic spatiotemporal platforms.

    Conclusions:

    • Temporal modulation is a powerful tool for designing advanced metamaterials and controlling wave phenomena.
    • Time-varying media offer pathways to unprecedented physical effects and technological applications.
    • The field of dynamic metamaterials is rapidly advancing, promising significant future innovations.