Yuan Huaxin, Yang Chenying, Zheng Xiaowen, Mu Wen, Wang Zhen, Yuan Wenjia, Zhang Yueguang, Chen Chaonan, Liu Xu, Shen Weidong
Opt Express. 2018 Oct 15;26(21):27885-27893. doi: 10.1364/OE.26.027885.
A simple and low-cost radiative cooler based on one-dimensional photonic crystal is proposed in this work, which has an average emissivity of 96% within the atmospheric transparency window (8-13μm). The ultra-broadband emissivity property is realized by constructing the strongly overlapped optical resonances with a tandem structure composed of two lossy materials while an additional lossless material is adopted as the top layer to reduce the Fresnel reflection of the whole structure. The maximum cooling power density of the fabricated radiative cooler can reach 113.0W/m at night. When integrated with an excellent solar reflector that can reflect 97% incident solar power, it theoretically has the maximum cooling power of 83.0 W/m in the case of solar irradiance up to 1000 W/m at noon.
本文提出了一种基于一维光子晶体的简单且低成本的辐射冷却器，其在大气透明窗口（8 - 13μm）内的平均发射率为96%。通过用由两种有损耗材料组成的串联结构构建强重叠光学共振来实现超宽带发射率特性，同时采用额外的无损耗材料作为顶层以降低整个结构的菲涅尔反射。所制备的辐射冷却器在夜间的最大冷却功率密度可达113.0W/m²。当与能反射97%入射太阳能的优质太阳能反射器集成时，在中午太阳辐照度高达1000W/m²的情况下，理论上其最大冷却功率为83.0W/m²。
