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    Researchers optimized electromagnetic wave absorption using a genetic algorithm (GA) for ultra-broadband applications. Certain metal/dielectric combinations achieved over 99% absorption across visible and near-infrared wavelengths.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Computational Physics

    Background:

    • Complete absorption of electromagnetic waves is crucial for applications like photovoltaics and device protection.
    • Optimizing absorption requires advanced strategies for material and structural design.

    Purpose of the Study:

    • To optimize absorption properties of periodic arrays of truncated square-based pyramids.
    • To achieve ultra-broadband quasi-perfect absorption (420-1600 nm) using metal/dielectric stacks.
    • To explore various metal (Ni, Ti, Al, Cr, Ag, Cu, W) and dielectric (PMMA) combinations.

    Main Methods:

    • Utilized a genetic algorithm (GA) to explore over 10^17 configurations.
    • Investigated periodic arrays of truncated square-based pyramids with alternating metal/dielectric layers.
    • Analyzed absorption performance for different numbers of metal/dielectric stacks.

    Main Results:

    • Identified Ni/PMMA, Ti/PMMA, Cr/PMMA, and W/PMMA as high-performance absorbers.
    • Achieved integrated absorptance exceeding 99% over the 420-1600 nm range.
    • Demonstrated robustness to geometrical variations and maintained performance over a broad angular range.

    Conclusions:

    • Metal/PMMA combinations, particularly with Ni, Ti, Cr, and W, offer effective ultra-broadband absorption solutions.
    • Noble metals (Au, Ag, Cu) did not yield the highest performance in this specific configuration.
    • The developed absorbers are suitable for realistic implementation in various electromagnetic applications.