期刊
NANO LETTERS
卷 15, 期 2, 页码 1217-1221出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl504332t
关键词
Near field; energy transfer; hyperbolic metamaterials
类别
资金
- US National Science Foundation (NSF) [CBET-1253692]
- US Defense Advanced Research Projects Agency (DARPA) [D14AP00008]
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [1253692] Funding Source: National Science Foundation
Although blackbody radiation described by Plancks law is commonly regarded as the maximum of thermal radiation, thermal energy transfer in the near-field can exceed the blackbody limit due to the contribution from evanescent waves. Here, we demonstrate experimentally a broadband thermal energy extraction device based on hyperbolic metamaterials that can significantly enhance near-field thermal energy transfer. The thermal extractor made from hyperbolic metamaterials does not absorb or emit any radiation but serves as a transparent pipe guiding the radiative energy from the emitter. At the same gap between an emitter and an absorber, we observe that near-field thermal energy transfer with thermal extraction can be enhanced by around 1 order of magnitude, compared to the case without thermal extraction. The novel thermal extraction scheme has important practical implications in a variety of technologies, e.g., thermophotovoltaic energy conversion, radiative cooling, thermal infrared imaging, and heat assisted magnetic recording.
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