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Nano Lett. 2013 Apr 10;13(4):1457-61. doi: 10.1021/nl4004283. Epub 2013 Mar 11.

Ultrabroadband photonic structures to achieve high-performance daytime radiative cooling.

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Department of Applied Physics, Stanford University, Stanford, California 94305, United States.


If properly designed, terrestrial structures can passively cool themselves through radiative emission of heat to outer space. For the first time, we present a metal-dielectric photonic structure capable of radiative cooling in daytime outdoor conditions. The structure behaves as a broadband mirror for solar light, while simultaneously emitting strongly in the mid-IR within the atmospheric transparency window, achieving a net cooling power in excess of 100 W/m(2) at ambient temperature. This cooling persists in the presence of significant convective/conductive heat exchange and nonideal atmospheric conditions.

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