Passive radiative cooling plays an essential role in global energy conservation and environment preservation. We designed a single medium cone SiO on Ag, which reflects more than 96% sunlight and emits near-unity infrared between –. Under direct sunlight of 10 W/m, the designed cooler can effectively achieve a predicted steady-state temperature of 261 K, which is 39 K below ambient at 300 K without consideration of thermal convection and conduction. When considering the significant influence of external conduction and convection (10 W/m/K), the net cooling power of the cooler is about 121 W/m at K, and the predicted steady-state temperature is 9 K below ambient. When sunlight is shielded, the net cooling power is 160 W/m and the predicted steady-state temperature is 244 K at W/m/K and 288 K at W/m/K. It benefits from the zero transmission of Ag, the particular extinction coefficient of SiO and the optimized structure. Furthermore, we explored the inner mechanism through studying the dependences of spectra on structure, geometry parameters as well as electromagnetic field distributions. The excellent performances of passive cooling with simple and compatible structure and mature SiO can effectively enhance the efficiency of the cooling system, and promote the practical application for radiative cooling greatly.

中文翻译：

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基于金属Ag上的单电介质SiO2的用于日间被动辐射冷却的超宽带热辐射器

被动辐射冷却在全球节能和环境保护中发挥着重要作用。我们在 Ag 上设计了单个中等锥体 SiO，它反射超过 96% 的太阳光，并在 – 之间发射近乎统一的红外线。在 10 W/m 的直射阳光下，所设计的冷却器可以有效地实现 261 K 的预测稳态温度，在不考虑热对流和传导的情况下，比环境温度 300 K 低 39 K。当考虑外部传导和对流（10 W/m/K）的显着影响时，冷却器的净冷却功​​率在 K 时约为 121 W/m，预测的稳态温度比环境温度低 9 K。当阳光被遮挡时，净冷却功率为 160 W/m，预测稳态温度为 244 K（W/m/K）和 288 K（W/m/K）。它得益于Ag的零透过率、SiO独特的消光系数以及优化的结构。此外，我们通过研究光谱对结构、几何参数以及电磁场分布的依赖性来探索其内在机制。简单兼容的结构和成熟的SiO的被动冷却的优异性能可以有效提高冷却系统的效率，极大地促进辐射冷却的实际应用。