Broadband directional control of thermal emission

doi:10.1126/science.abc5381

GSTDTAP > 气候变化

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
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).