宽带
发射率
超材料
光学
材料科学
摩尔吸收率
超材料吸收剂
辐射传输
低发射率
散热片
被动冷却
光电子学
辐射冷却
可调谐超材料
热辐射
热的
物理
热力学
气象学
作者
Bin Wei,Zhu Han,Qiuyue Wu,Guoxiong Cai,Qing Liu
出处
期刊:Applied Optics
[The Optical Society]
日期:2023-07-12
卷期号:62 (21): 5660-5660
摘要
Radiative cooling, which needs no external energy to lower the temperature, has drawn great interest in recent years. As a potential candidate, the design of a metamaterial cooler remains a big challenge due to the complexity of the nanostructure and the low average absorptivity. In this work, a capped metal-insulator-metal metamaterial is proposed to achieve ultra-broadband perfect absorbing. The numerical results show that its average absorptivity is 94% in the 8-13 µm wavelength band under normal incidence, bringing about the excellent selective thermal emissivity in the IR atmospheric transparent window. Together with polarization insensitivity and wide angle independency, the proposed metamaterial can realize a net cooling power as high as 120.7W/m2 under the circumstance without sunshine. As a proof of concept, it is applied to coat the heat sink of a 3D integrated circuit chip. The result shows that the temperature of the observation point lowers 18.3 K after coating. This work offers the promising application of passive radiative cooling in thermal management for personnel, electronic devices, and many others.
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