Journal
APPLIED PHYSICS LETTERS
Volume 106, Issue 10, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4914886
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Funding
- National Science Foundation [ECCS-1405201, ECCS-1425648]
- U.S. Department of Energy's National Nuclear Security Administration [DE-AC04 94AL85000]
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1425648, 1405201] Funding Source: National Science Foundation
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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. (C) 2015 AIP Publishing LLC.
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