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Suppressed-scattering spectral windows for radiative cooling applications.

José M Pérez-Escudero, Alicia E Torres-García, Carlos Lezaun

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    Material dispersion significantly impacts nanoparticle scattering for daylight radiative cooling. Dispersive nanoparticles create suppressed-scattering windows for selective thermal emission, enabling tunable cooling in materials like concrete.

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    Area of Science:

    • Nanophotonics and Materials Science
    • Optics and Photonics
    • Thermal Engineering

    Background:

    • Daylight radiative cooling utilizes resonant nanoparticles to enhance solar reflectance.
    • Understanding material dispersion is crucial for optimizing nanoparticle scattering performance.
    • Current research focuses on tailoring nanoparticle properties for efficient radiative cooling.

    Purpose of the Study:

    • To investigate the influence of material dispersion on nanoparticle scattering for radiative cooling.
    • To identify how dispersion affects scattering properties across different frequencies.
    • To explore the potential of dispersive materials for tunable thermal emission.

    Main Methods:

    • Theoretical analysis of light scattering by resonant nanoparticles.
    • Numerical simulations to model scattering performance with material dispersion.
    • Investigation of suppressed-scattering windows in various material compositions.
    • Experimental validation using calcium-silicate-hydrate (CSH) as a dispersive host.

    Main Results:

    • Material dispersion fundamentally alters infrared scattering properties of nanoparticles, despite similar visible frequency responses.
    • Dispersive nanoparticles exhibit suppressed-scattering windows, enabling selective thermal emission within highly reflective materials.
    • These suppressed-scattering windows are wavelength-pinned and independent of material arrangement (random composites or periodic metasurfaces).
    • Co-design of nanoparticles and dispersive hosts, like CSH, allows for tuning of these windows.

    Conclusions:

    • Material dispersion is a critical factor in designing nanoparticles for radiative cooling.
    • Suppressed-scattering windows offer a pathway for achieving selective thermal emission and enhanced cooling.
    • Controlled nanoporosities in materials like concrete could lead to passive radiative cooling capabilities.