Tunneling-enabled spectrally selective thermal emitter based on flat metallic films

Infrared thermal emission from metals has important energy applications in thermophotovoltaics, radiative cooling, and lighting. Unfortunately, the emissivity of flat metal films is close to zero because the screening effect prevents metals' fluctuating currents from emitting to the far field....

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Bibliographic Details
Published in:Applied physics letters 2015-03, Vol.106 (10)
Main Authors: Wang, Zhu, Tan, Yixuan, Zhou, Ming, Yu, Zongfu, Luk, Ting Shan, Ji, Dengxin, Gan, Qiaoqiang
Format: Article
Language:English
Subjects:
CONTROL
EMISSION
EMISSIVITY
ENERGY CONVERSION
HEAT
INFRARED RADIATION
METALS
METAMATERIALS
MIRRORS
NANOSCIENCE AND NANOTECHNOLOGY
NANOSTRUCTURES
RADIATIVE COOLING
TUNNEL EFFECT
VISIBLE RADIATION
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Summary:Infrared thermal emission from metals has important energy applications in thermophotovoltaics, radiative cooling, and lighting. Unfortunately, the emissivity of flat metal films is close to zero because the screening effect prevents metals' fluctuating currents from emitting to the far field. As a result, metal films are often used as reflecting mirrors instead of thermal emitters. Recently, nanostructured metals, such as metamaterials, have emerged as an interesting way to enhance and to spectrally control thermal emission based on plasmonic resonant effects. However, they require sophisticated lithography. Here, we proposed and experimentally demonstrated a completely different mechanism to achieve spectrally selective metallic emitters based on a tunneling effect. This effect allows a simple flat metal film to achieve a near-unity emissivity with controlled spectral selectivity for efficient heat-to-light energy conversion.
ISSN:0003-6951
1077-3118