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Microstructured surfaces for colored and non-colored sky radiative cooling.

Etienne Blandre, Refet Ali Yalçin, Karl Joulain

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    We developed a simple, textured silica-on-silver structure for passive radiative cooling. This design achieves near-ideal optical properties, enabling efficient cooling and tunable coloration through resonant absorption.

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    Area of Science:

    • Materials Science
    • Optics
    • Nanotechnology

    Background:

    • Passive radiative cooling offers a sustainable alternative for thermal management.
    • Optimizing material properties is crucial for efficient radiative cooling performance.
    • Achieving both cooling and aesthetic coloration presents a design challenge.

    Purpose of the Study:

    • To propose and analyze a novel structure for passive sky radiative cooling.
    • To investigate the role of surface texturation and resonant absorption in optical properties.
    • To explore the potential for tunable coloration in radiative cooling devices.

    Main Methods:

    • Electromagnetic simulations were employed to model the optical properties of the proposed structure.
    • The structure consists of a surface-textured silica layer on a silver substrate.
    • Thin transparent layers were integrated to achieve resonant absorption and coloration.

    Main Results:

    • The silica-on-silver structure exhibits near-ideal optical properties for radiative cooling.
    • Surface texturation is essential for achieving high infrared emissivity.
    • Resonant absorption within thin layers enables coloration without significantly compromising cooling power.
    • Multiple resonators expand the achievable color palette.

    Conclusions:

    • The proposed simple structure demonstrates high potential for efficient passive radiative cooling.
    • Surface texturation and resonant absorption are key design elements for performance and aesthetics.
    • This approach offers a pathway towards multifunctional radiative cooling materials with tunable colors.