Realization of an Adaptive Radiative Cooler with a Multilayer-Filter VO₂-Based Fabry–Pérot Cavity

Abstract

A high-performance adaptive radiative cooler comprising of multilayer filter and VO2-based Fabry-Perot (FP) cavity has been proposed. The bottom FP cavity adopts four layers of VO2/NaCl/PVC/Ag. Based on the phase transition of VO2, the average emissivity in the transparent window can be switched from 3.7% to 96.3%. Additionally, the average emissivity can also be adjusted with external strain to the PVC layer, providing another way to attain the desired cooling effect. The upper filter is included to block most of the solar radiation and provide a transmittance of 96.7% in the atmospheric window. At high temperature, the adaptive emitter automatically activates radiative cooling. The net cooling power is up to 156.4 W/m2 at an ambient temperature of 303 K. Our adaptive emitter still exhibits stable selective emissivity at different incident angle and heat transfer coefficient. At low temperature, the radiative cooling automatically deactivates, and the average emissivity decreases to only 3.8%. Therefore, our work not only provides new insights into the design of high-performance adaptive radiative coolers, but also advances the development of intelligent thermal management.

Tunable plasmon-induced transparency in anisotropic graphene-black phosphorus photonic device for high-performance sensors and switchers

“…PIT involves the manipulation of light transmission in metamaterials through the interaction of plasmonic resonances with constituent unit cells [7][8][9]. In the early stage, the constructed metamaterials primarily utilize the metallic or dielectric unit cells [10][11][12][13][14][15][16][17]. Recently, the combination of metamaterials with two-dimensional (2D) materials such as graphene and BP to realize PIT effect has attracted much attentions [18][19][20].…”