Dancing the tight rope on the nanoscale—Calibrating a heat flux sensor of a scanning thermal microscope

Kloppstech, Konstantin; Könne, Nils; Worbes, Ludwig; Hellmann, David; Kittel, A.

doi:10.1063/1.4935586

Cited by 2 publications

(3 citation statements)

References 43 publications

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“…The details of this calibration method can be found in ref. 35 . For the NSThM probe used in our measurements we find a calibration factor of ε =0.43 μW per μV.…”

Section: Methodsmentioning

confidence: 99%

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Giant heat transfer in the crossover regime between conduction and radiation

et al. 2017

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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.

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“…The details of this calibration method can be found in ref. 35 . For the NSThM probe used in our measurements we find a calibration factor of ε =0.43 μW per μV.…”

Section: Methodsmentioning

confidence: 99%

“…Our calibration method enables us to measure absolute heat fluxes between the probe and the sample with a relative uncertainty of about 14% (details of the error analysis leading to this uncertainty can be found in ref. 35 ).…”

Section: Methodsmentioning

confidence: 99%

Giant heat transfer in the crossover regime between conduction and radiation

et al. 2017

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“…Experimental data on heat transfer between a tip and a planar sample. The data were taken with thermal scanning microscopes [10,22] that allow for a simultaneous measurement of the electronic tunnelling current (onset at distances shorter than d ∼ 0.5−1 nm, right scale). The shaded areas illustrate the typical measurement uncertainties.…”

Section: Model For Experimental Datamentioning

confidence: 99%

On anomalously large nano-scale heat transfer between metals

Henkel

Schmidt

2019

J. Opt. Soc. Am. B

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The non-contact heat transfer between two bodies is more efficient than the Stefan-Boltzmann law, when the distances are on the nanometer scale (shorter than Wien's wavelength), due to contributions of thermally excited near fields. This is usually described in terms of the fluctuation electrodynamics due to Rytov, Levin, and co-workers. Recent experiments in the tip-plane geometry have reported "giant" heat currents between metallic (gold) objects, exceeding even the expectations of Rytov theory. We discuss a simple model that describes the distance dependence of the data and permits to compare to a plate-plate geometry, as in the proximity (or Derjaguin) approximation. We extract an area density of active channels which is of the same order for the experiments performed by the groups of Kittel (Oldenburg) and Reddy (Ann Arbor). It is argued that mechanisms that couple phonons to an oscillating surface polarisation are likely to play a role.

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Dancing the tight rope on the nanoscale—Calibrating a heat flux sensor of a scanning thermal microscope

Cited by 2 publications

References 43 publications

Giant heat transfer in the crossover regime between conduction and radiation

Giant heat transfer in the crossover regime between conduction and radiation

On anomalously large nano-scale heat transfer between metals

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