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Large-range, continuously tunable perfect absorbers based on Dirac semimetals.

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    Optics Express
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    Summary

    We developed a tunable optical absorber using bulk Dirac semimetals (BDS) meta-atoms. This novel plasmonic metamaterial allows precise control over light absorption frequencies for advanced optical devices.

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    Area of Science:

    • Photonics and Materials Science
    • Optics and Light Manipulation

    Background:

    • Plasmonic metamaterials offer subwavelength light control but achieving tunable, high-performance optical absorbers is difficult.
    • Existing plasmonic metamaterials face challenges in dynamic tunability and broad-range absorption control.

    Purpose of the Study:

    • To propose and demonstrate a continuously tunable optical absorber based on plasmonic metamaterials.
    • To achieve precise control over absorption frequencies by utilizing bulk Dirac semimetals (BDS).

    Main Methods:

    • Fabrication of a tunable absorber comprising a zigzag array of BDS meta-atoms and a metal reflector.
    • Utilizing electric dipole modes and coupled-mode theory (CMT) and mode-expansion theory (MET) for analysis.
    • Controlling resonance frequency via unit cell geometry and BDS Fermi energy level tuning.

    Main Results:

    • Demonstration of a continuously tunable optical absorber with high performance.
    • Precise control over the resonance frequency by adjusting geometric parameters and Fermi levels.
    • Validation of the absorption mechanism using coupled-mode theory (CMT) and mode-expansion theory (MET).

    Conclusions:

    • The proposed BDS-based metamaterial offers a promising platform for dynamically tunable optical absorbers.
    • This work provides insights into the physical mechanisms governing tunable absorption in metamaterials.
    • The findings could spur further research into BDS-based tunable metamaterial devices.