Near-field radiative heat transfer between macroscopic planar surfaces

Abstract

Near-field radiative heat transfer allows heat to propagate across a small vacuum gap in quantities that are several orders of magnitude greater then the heat transfer by far-field, blackbody radiation. Although heat transfer via near-field effects has been discussed for many years, experimental verification of this theory has been very limited. We have measured the heat transfer between two macroscopic sapphire plates, finding an increase in agreement with expectations from theory. These experiments, conducted near 300 K, have measured the heat transfer as a function of separation over mm to $\mu$m and as a function of temperature differences between 2.5 and 30 K. The experiments demonstrate that evanescence can be put to work to transfer heat from an object without actually touching it.

References in corpus (3)

• Near-field heat transfer in a scanning thermal microscope
• A mesoscopic description of radiative heat transfer at the nanoscale
• Fundamental limits for non-contact transfers between two bodies

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