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DOI | 10.1126/science.abc5381 |
Broadband directional control of thermal emission | |
Jin Xu; Jyotirmoy Mandal; Aaswath P. Raman | |
2021-04-23 | |
发表期刊 | Science
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出版年 | 2021 |
英文摘要 | Thermal radiation emits over a wide range of wavelengths and over a wide range of angles. Xu et al. constructed a material that allows a range of wavelengths to emit over a much narrower range of angles. This property allowed the authors to beam thermal energy preferentially in one direction. The strategy requires carefully exploiting stacks of epsilon-near-zero films in which the angular range of thermal emission is controlled by the film thickness. This design could be useful in thermal camouflage and passive radiative cooling applications. Science , this issue p. [393][1] Controlling the directionality of emitted far-field thermal radiation is a fundamental challenge. Photonic strategies enable angular selectivity of thermal emission over narrow bandwidths, but thermal radiation is a broadband phenomenon. The ability to constrain emitted thermal radiation to fixed narrow angular ranges over broad bandwidths is an important, but lacking, capability. We introduce gradient epsilon-near-zero (ENZ) materials that enable broad-spectrum directional control of thermal emission. We demonstrate two emitters consisting of multiple oxides that exhibit high (>0.7, >0.6) directional emissivity (60° to 75°, 70° to 85°) in the p-polarization for a range of wavelengths (10.0 to 14.3 micrometers, 7.7 to 11.5 micrometers). This broadband directional emission enables meaningful radiative heat transfer primarily in the high emissivity directions. Decoupling the conventional limitations on angular and spectral response improves performance for applications such as thermal camouflaging, solar heating, radiative cooling, and waste heat recovery. [1]: /lookup/doi/10.1126/science.abc5381 |
领域 | 气候变化 ; 资源环境 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/324080 |
专题 | 气候变化 资源环境科学 |
推荐引用方式 GB/T 7714 | Jin Xu,Jyotirmoy Mandal,Aaswath P. Raman. Broadband directional control of thermal emission[J]. Science,2021. |
APA | Jin Xu,Jyotirmoy Mandal,&Aaswath P. Raman.(2021).Broadband directional control of thermal emission.Science. |
MLA | Jin Xu,et al."Broadband directional control of thermal emission".Science (2021). |
条目包含的文件 | 条目无相关文件。 |
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