Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2009-09-03
Arvind Narayanaswamy, Sheng Shen, and Gang Chen, "Near-field radiative heat transfer between a sphere and a substrate," Phys.
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
12 pages, 2 figures
Scientific paper
10.1103/PhysRevB.78.115303
Near-field force and energy exchange between two objects due to quantum electrodynamic fluctuations give rise to interesting phenomena such as Casimir and van der Waals forces, and thermal radiative transfer exceeding Planck's theory of blackbody radiation. Although significant progress has been made in the past on the precise measurement of Casimir force related to zero-point energy, experimental demonstration of near-field enhancement of radiative heat transfer is difficult. In this work, we present a sensitive technique of measuring near-field radiative transfer between a microsphere and a substrate using a bi-material atomic force microscope (AFM) cantilever, resulting in "heat transfer-distance" curves. Measurements of radiative transfer between a sphere and a flat substrate show the presence of strong near-field effects resulting in enhancement of heat transfer over the predictions of the Planck blackbody radiation theory.
Chen Gang
Narayanaswamy Arvind
Shen Sheng
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