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    Area of Science:

    • Optics and Photonics
    • Metamaterials and Nanophotonics

    Background:

    • Strip arrays are classical antenna structures enabling novel material properties and device functionalities.
    • Metal-insulator-metal (MIM) geometries are crucial for developing advanced optical devices.

    Purpose of the Study:

    • To demonstrate wide-angle broadband absorption using tapered strip arrays in patch antennas.
    • To achieve high absorption efficiency over a broad frequency range in the mid-infrared region.

    Main Methods:

    • Designing patch antennas with tapered strip arrays in an MIM geometry.
    • Utilizing superimposed multiple resonances associated with tapered strip widths.
    • Investigating the coupling mechanism between magnetic resonances and incident light.

    Main Results:

    • Achieved near-perfect absorption (efficiency >80%) over a wide bandwidth (29.2 THz to 38 THz).
    • Demonstrated absorption insensitive to incident angles up to 75°.
    • Attributed angle-independent absorption to the coupling of magnetic resonances with incident light.

    Conclusions:

    • The tapered patch antenna design offers a simple and flexible approach for engineering materials.
    • The developed device enables strong omnidirectional absorption with variable and wide bandwidth.
    • Potential applications include bolometric sensing, camouflaging, and spectral filtering.