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Title: 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. 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.
Authors:
; ; ;  [1] ;  [2] ; ;  [3]
  1. Department of Electrical and Computer Engineering, University of Wisconsin-Madison, Wisconsin 53706 (United States)
  2. Center for Integrated Nanotechnologies (CINT), Sandia National Laboratories, Albuquerque, New Mexico 87185 (United States)
  3. Department of Electrical and Computer Engineering, New York State University of Buffalo, Buffalo, New York 14260 (United States)
Publication Date:
OSTI Identifier:
22395690
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 10; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; CONTROL; EMISSION; EMISSIVITY; ENERGY CONVERSION; FILMS; HEAT; INFRARED RADIATION; METALS; METAMATERIALS; MIRRORS; NANOSTRUCTURES; RADIATIVE COOLING; TUNNEL EFFECT; VISIBLE RADIATION