Giant heat transfer in the crossover regime between conduction and radiation

Konstantin Kloppstech, Nils Könne, Svend-Age Biehs, Alejandro W. Rodriguez, Ludwig Worbes, David Hellmann and Achim Kittel ()
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Konstantin Kloppstech: Institute of Physics, Carl von Ossietzky University of Oldenburg
Nils Könne: Institute of Physics, Carl von Ossietzky University of Oldenburg
Svend-Age Biehs: Institute of Physics, Carl von Ossietzky University of Oldenburg
Alejandro W. Rodriguez: Princeton University
Ludwig Worbes: Institute of Physics, Carl von Ossietzky University of Oldenburg
David Hellmann: Institute of Physics, Carl von Ossietzky University of Oldenburg
Achim Kittel: Institute of Physics, Carl von Ossietzky University of Oldenburg

Nature Communications, 2017, vol. 8, issue 1, 1-5

Abstract: Abstract Heat is transferred by radiation between two well-separated bodies at temperatures of finite difference in vacuum. At large distances the heat transfer can be described by black body radiation, at shorter distances evanescent modes start to contribute, and at separations comparable to inter-atomic spacing the transition to heat conduction should take place. We report on quantitative measurements of the near-field mediated heat flux between a gold coated near-field scanning thermal microscope tip and a planar gold sample at nanometre distances of 0.2–7 nm. We find an extraordinary large heat flux which is more than five orders of magnitude larger than black body radiation and four orders of magnitude larger than the values predicted by conventional theory of fluctuational electrodynamics. Different theories of phonon tunnelling are not able to describe the observations in a satisfactory way. The findings demand modified or even new models of heat transfer across vacuum gaps at nanometre distances.

Date: 2017
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DOI: 10.1038/ncomms14475

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