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    Researchers developed a novel 3D nanostructured hyperbolic metamaterial (HMM) for efficient solar-to-thermal energy conversion. This wideband spectral-selective absorber achieves near-unity absorption and 95.5% conversion efficiency, enhancing solar energy harvesting technologies.

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    Area of Science:

    • Materials Science
    • Nanotechnology
    • Renewable Energy

    Background:

    • Efficient solar-to-thermal conversion is crucial for renewable energy technologies like solar thermo-photovoltaics and thermo-electric systems.
    • Solar-selective absorbers with tailored characteristics are essential for maximizing energy conversion efficiency.

    Purpose of the Study:

    • To propose and demonstrate a wideband spectral-selective absorber for enhanced solar energy utilization.
    • To achieve high solar-to-thermal conversion efficiency using advanced nanostructured materials.

    Main Methods:

    • Design and fabrication of a three-dimensional (3D) nanostructured hyperbolic metamaterial (HMM).
    • Manipulation of optical topological transition (OTT) of iso-frequency surface (IFS) to enhance light absorption across the solar spectrum.
    • Characterization of absorption properties across UV and NIR spectral ranges and over a wide range of incident angles.

    Main Results:

    • Near-unity absorption achieved across the UV and NIR spectral ranges.
    • Demonstrated selective enhancement of light absorption throughout the entire solar spectrum via OTT.
    • Achieved an impressive solar-to-thermal conversion efficiency of 95.5%.
    • Superior absorption properties maintained over a wide range of incident angles.

    Conclusions:

    • The developed 3D nanostructured HMM serves as a highly efficient wideband spectral-selective absorber.
    • The ability to manipulate OTT offers a new pathway for optimizing light absorption in solar thermal devices.
    • This work paves the way for designing high-performance solar thermal devices and advancing solar energy harvesting.