Abstract
We predict that the near-field radiative heat-transfer rate between a cylinder and a perforated surface depends nonmonotonically on their separation. This anomalous behavior, which arises due to evanescent-wave effects, is explained using a heuristic model based on the interaction of a dipole with a plate. We show that nonmonotonicity depends not only on geometry and temperature but also on material dispersion—for micron and submicron objects, nonmonotonicity is present in polar dielectrics but absent in metals with small skin depths.
- Received 12 July 2012
DOI:https://doi.org/10.1103/PhysRevLett.110.014301
© 2013 American Physical Society
Synopsis
Up Close, A Warm Glow Turns Cooler
Published 2 January 2013
Radiative heat transfer usually increases at shorter separation distances, but new calculations describe micron-scale cases where less heat is exchanged as two objects approach.
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