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Title: Study of radiative heat transfer in Ångström- and nanometre-sized gaps

Abstract

Radiative heat transfer in Ångström- and nanometre-sized gaps is of great interest because of both its technological importance and open questions regarding the physics of energy transfer in this regime. Here in this paper we report studies of radiative heat transfer in few Å to 5nm gap sizes, performed under ultrahigh vacuum conditions between a Au-coated probe featuring embedded nanoscale thermocouples and a heated planar Au substrate that were both subjected to various surface-cleaning procedures. By drawing on the apparent tunnelling barrier height as a signature of cleanliness, we found that upon systematically cleaning via a plasma or locally pushing the tip into the substrate by a few nanometres, the observed radiative conductances decreased from unexpectedly large values to extremely small ones—below the detection limit of our probe—as expected from our computational results. Our results show that it is possible to avoid the confounding effects of surface contamination and systematically study thermal radiation in Ångström- and nanometre-sized gaps.

Authors:
 [1];  [1];  [2]; ORCiD logo [2];  [3]; ORCiD logo [2];  [1];  [4]
  1. Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Mechanical Engineering
  2. Univ. Autonoma de Madrid (Spain). Dept. de Fisica Teorica de la Materia Condensada and Condensed Matter Physics Center (IFIMAC)
  3. Univ. Autonoma de Madrid (Spain). Dept. de Fisica Teorica de la Materia Condensada and Condensed Matter Physics Center (IFIMAC); Donostia International Physics Center, San Sebastian (Spain)
  4. Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Mechanical Engineering; Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Materials Science and Engineering
Publication Date:
Research Org.:
Univ. of Michigan, Ann Arbor, MI (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); European Research Council (ERC); US Department of the Navy, Office of Naval Research (ONR); Comunidad de Madrid
OSTI Identifier:
1366540
Grant/Contract Number:  
SC0004871; N00014-16-1-2672; FIS2014-53488-P; S2013/MIT-2740
Resource Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 8; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; Nanometrology; Nanophotonics and plasmonics; Optical metrology

Citation Formats

Cui, Longji, Jeong, Wonho, Fernández-Hurtado, Víctor, Feist, Johannes, García-Vidal, Francisco J., Cuevas, Juan Carlos, Meyhofer, Edgar, and Reddy, Pramod. Study of radiative heat transfer in Ångström- and nanometre-sized gaps. United States: N. p., 2017. Web. doi:10.1038/ncomms14479.
Cui, Longji, Jeong, Wonho, Fernández-Hurtado, Víctor, Feist, Johannes, García-Vidal, Francisco J., Cuevas, Juan Carlos, Meyhofer, Edgar, & Reddy, Pramod. Study of radiative heat transfer in Ångström- and nanometre-sized gaps. United States. doi:10.1038/ncomms14479.
Cui, Longji, Jeong, Wonho, Fernández-Hurtado, Víctor, Feist, Johannes, García-Vidal, Francisco J., Cuevas, Juan Carlos, Meyhofer, Edgar, and Reddy, Pramod. Wed . "Study of radiative heat transfer in Ångström- and nanometre-sized gaps". United States. doi:10.1038/ncomms14479. https://www.osti.gov/servlets/purl/1366540.
@article{osti_1366540,
title = {Study of radiative heat transfer in Ångström- and nanometre-sized gaps},
author = {Cui, Longji and Jeong, Wonho and Fernández-Hurtado, Víctor and Feist, Johannes and García-Vidal, Francisco J. and Cuevas, Juan Carlos and Meyhofer, Edgar and Reddy, Pramod},
abstractNote = {Radiative heat transfer in Ångström- and nanometre-sized gaps is of great interest because of both its technological importance and open questions regarding the physics of energy transfer in this regime. Here in this paper we report studies of radiative heat transfer in few Å to 5nm gap sizes, performed under ultrahigh vacuum conditions between a Au-coated probe featuring embedded nanoscale thermocouples and a heated planar Au substrate that were both subjected to various surface-cleaning procedures. By drawing on the apparent tunnelling barrier height as a signature of cleanliness, we found that upon systematically cleaning via a plasma or locally pushing the tip into the substrate by a few nanometres, the observed radiative conductances decreased from unexpectedly large values to extremely small ones—below the detection limit of our probe—as expected from our computational results. Our results show that it is possible to avoid the confounding effects of surface contamination and systematically study thermal radiation in Ångström- and nanometre-sized gaps.},
doi = {10.1038/ncomms14479},
journal = {Nature Communications},
number = ,
volume = 8,
place = {United States},
year = {2017},
month = {2}
}

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