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Actively tunable linear and circular dichroic metamirrors based on single-layer graphene.

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    This study introduces tunable graphene metamirrors for efficient linear and circular dichroism. These advanced optical devices offer dual functionality and wide applicability in terahertz imaging and sensing.

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    Area of Science:

    • Metamaterials
    • Optics
    • Nanotechnology

    Background:

    • Existing dichroic metamirrors suffer from low efficiency, limited functionality, and structural complexity.
    • There is a need for advanced metamirror designs offering tunable dichroic properties.

    Purpose of the Study:

    • To propose actively tunable linear and circular dichroic metamirrors utilizing single-layer graphene.
    • To overcome the limitations of current metamirror technologies.

    Main Methods:

    • Designing metamirrors composed of ion-gel, patterned graphene, polyimide, polysilicon, and gold substrates.
    • Exploiting the anisotropy of achiral structures and incidence angle for strong dichroism.
    • Tuning the Fermi level of graphene to control dichroic properties.

    Main Results:

    • Achieved simultaneous circular dichroism (0.8) and linear dichroism (0.9) without functional switching.
    • Demonstrated exceptionally strong dichroism dependent on incidence angle, not structural chirality.
    • Tuned circular dichroism (CD) from 0 to 0.8 and linear dichroism (LD) from 0.22 to 0.9 by altering graphene's Fermi level.
    • Reduced angular dispersion and structural complexity, enhancing integration.

    Conclusions:

    • The proposed graphene metamirrors offer dual, tunable linear and circular dichroic functions over a wide angular range.
    • These metamirrors present a significant advancement for applications in terahertz imaging, biological detection, optical sensing, and spectrometry.