Example of metal-multi-dielectric-metal cooling metamaterial use in engineering thermal radiation

This paper introduces radiative cooling metamaterial use in engineering thermal radiation based on metal-multi-dielectric-metal (MMDM) structure. The measured average absorption of the MMDM from 15° to 75° in the "atmosphere window" is 0.81, and the absorption range of the structure hardly changes with the incident angles. Without considering solar radiation, at the thermal conductivity of 6.9  W·m^-2·K^-1, the surface temperature is 10.8°C lower than the ambient temperature (300 K), and the cooling power is 102  W·m^-2. Importantly, when the surface temperature is higher than the ambient temperature, this radiative cooler can lower the surface temperature in engineering thermal radiation with a higher thermal conductivity at the same cooling power.