Suppressed-scattering spectral windows for radiative cooling applications

Author:

Pérez-Escudero José M.,Torres-García Alicia E.,Lezaun Carlos,Caggiano Antonio1,Peralta Ignacio234,Dolado Jorge S.56,Beruete MiguelORCID,Liberal IñigoORCID

Affiliation:

1. University of Genova

2. Technische Universität Darmstadt

3. Universidad Nacional del Litoral (UNL)/ Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)

4. Universidad Tecnológica Nacional (UTN)

5. Centro de Física de Materiales CFM (CSIC-UPV/EHU)

6. Donostia International Physics Center (DIPC)

Abstract

The scattering of light by resonant nanoparticles is a key process for enhancing the solar reflectance in daylight radiative cooling. Here, we investigate the impact of material dispersion on the scattering performance of popular nanoparticles for radiative cooling applications. We show that, due to material dispersion, nanoparticles with a qualitatively similar response at visible frequencies exhibit fundamentally different scattering properties at infrared frequencies. It is found that dispersive nanoparticles exhibit suppressed-scattering windows, allowing for selective thermal emission within a highly reflective sample. The existence of suppressed-scattering windows solely depends on material dispersion, and they appear pinned to the same wavelength even in random composite materials and periodic metasurfaces. Finally, we investigate calcium-silicate-hydrate (CSH), the main phase of concrete, as an example of a dispersive host, illustrating that the co-design of nanoparticles and host allows for tuning of the suppressed-scattering windows. Our results indicate that controlled nanoporosities would enable concrete with daylight passive radiative cooling capabilities.

Funder

HORIZON EUROPE Framework Programme

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics

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