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    Researchers created a novel planar bidirectional perfect metamaterial absorber (PMA) that selectively absorbs and reflects specific polarized waves in both forward and backward directions, enabling advanced optical applications.

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    Area of Science:

    • Metamaterials
    • Electromagnetics
    • Nanophotonics

    Background:

    • Metamaterial absorbers are crucial for controlling electromagnetic waves.
    • Bidirectional wave manipulation with polarization selectivity remains a challenge.
    • Perfect metamaterial absorbers (PMAs) offer near-complete energy dissipation.

    Purpose of the Study:

    • To design and demonstrate a novel planar bidirectional perfect metamaterial absorber (PMA).
    • To achieve polarization-selective absorption and reflection for waves propagating in opposite directions.
    • To explore the potential for multiband applications.

    Main Methods:

    • Utilized full-wave electromagnetic simulations.
    • Employed Fabry-Perot cavity models for performance analysis.
    • Validated the design through free-space measurement of a fabricated sample.

    Main Results:

    • Achieved near-perfect absorption for both x- and y-polarized waves in the -z and +z directions.
    • Demonstrated polarization-selective reflection for waves propagating in -z and +z directions.
    • Successfully extended the design to a dual-band bidirectional absorber.

    Conclusions:

    • The proposed planar bidirectional PMA exhibits excellent polarization-selective absorption and reflection.
    • The design shows promise for integration into multiband optical systems.
    • This work advances the development of sophisticated metamaterial-based wave control devices.