发射率
辐射冷却
光学
低发射率
材料科学
谐振器
超材料
红外窗口
光电子学
热辐射
物理
红外线的
共振(粒子物理)
辐射传输
超材料吸收剂
原子物理学
天体物理学
热力学
可调谐超材料
作者
Dachuan Liu,Ying Xu,Yimin Xuan
出处
期刊:Applied Optics
[The Optical Society]
日期:2020-08-03
卷期号:59 (23): 6861-6861
被引量:9
摘要
The most intuitive approach for infrared stealth, namely, the indiscriminate suppression of thermal radiation, is often at the risk of overheating the target. Spectrally selective metamaterials may solve this problem by satisfying radiative cooling as well as infrared suppression. Therefore, we have designed and fabricated a broadband metamaterial by depositing a Fabry-Perot (F-P) resonator on top of a metal pattern. The composite structure has two absorption peaks, one originating from F-P resonance, the other from the magnetic resonance of the metal pattern, and they can be merged into the 5∼8 µm range through optimization. According to Kirchhoff's law, this results in high emissivity in the 5∼8 µm range (the best choice of nonatmospheric-window ranges) and low emissivity in the 3∼5 µm and 8∼14 µm ranges (the two atmospheric windows), satisfying both infrared suppression and radiative cooling. Energy dissipation distributions indicate apparent coupling of F-P resonance and magnetic resonance, but these two resonances are stronger at their respective intrinsic wavelengths. This paper reveals an alternative method for infrared suppression with radiative cooling, which is also meaningful in the design of broad/multiband absorbers.
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