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    This study presents a novel plasmonic-photonic structure for radiative cooling. The design achieves strong selective absorption in the 8-13 µm atmospheric window through coupled plasmonic and photonic resonances.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Nanotechnology

    Background:

    • Radiative cooling systems require materials with high spectral selectivity.
    • Plasmonic-photonic structures offer tunable optical properties for advanced applications.
    • Existing structures may lack scalability or optimal absorption characteristics.

    Purpose of the Study:

    • To design and theoretically investigate a scalable plasmonic-photonic structure for efficient radiative cooling.
    • To understand the underlying physics of selective absorption in the designed structure.
    • To explore the potential of coupled plasmonic and photonic resonances for thermal management.

    Main Methods:

    • Theoretical investigation of a plasmonic-photonic structure using colloidal lithography.
    • Modeling a core-shell structure composed of SiO2 and indium tin oxide (ITO) on an Au reflector.
    • Quantitative analysis using a coupled-oscillator model and a coupled-dipole method.

    Main Results:

    • The designed structure exhibits strong selective absorption within the 8-13 µm atmospheric transparency window.
    • Selective absorption is attributed to the mode splitting of localized surface plasmons (LSP) in the ITO shell.
    • Mode splitting arises from strong coupling between the ITO LSP and the SiO2 core's magnetic dipole Mie resonance.

    Conclusions:

    • The proposed plasmonic-photonic structure is a promising candidate for scalable radiative cooling systems.
    • The study elucidates the mechanism of mode splitting, crucial for achieving high spectral selectivity.
    • This work provides insights into designing advanced metamaterials for thermal management applications.