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    Area of Science:

    • Metamaterials
    • Nanophotonics
    • Electromagnetics

    Background:

    • Metamaterial perfect absorbers (MPAs) offer high absorption but often lack tunability.
    • Controlling material properties is key to dynamic optical responses.

    Purpose of the Study:

    • To demonstrate an electrically tunable MPA based on Mie resonance.
    • To investigate the effect of temperature-controlled permittivity on absorption frequency.

    Main Methods:

    • Fabrication of a ceramic dielectric cube on a copper film on a quartz substrate.
    • Application of direct current (DC) to heat the copper film and vary cube permittivity.
    • Numerical modeling and experimental validation of the MPA's performance.

    Main Results:

    • Achieved over 99% absorption across the tuning range.
    • Demonstrated a tunable absorption resonance frequency that increases with heating.
    • MPA performance was validated through numerical modeling and experimental results.

    Conclusions:

    • The developed MPA is miniaturized and tunable via electrical control.
    • This approach offers a versatile method for broadening absorption bandwidth and enabling new applications.
    • Potential applications include metasurfaces and cloaking devices using temperature gradients.