Volume 106, Number 4, May 2014
|Number of page(s)||6|
|Section||The Physics of Elementary Particles and Fields|
|Published online||28 May 2014|
Heat transfer between anisotropic nanoparticles: Enhancement and switching
1 Max-Planck-Institut für Intelligente Systeme - Heisenbergstr. 3, D-70569 Stuttgart, Germany
2 Institut für Theoretische Physik IV, Universität Stuttgart - Pfaffenwaldring 57, D-70569 Stuttgart, Germany
3 Laboratoire de Physique Théorique et Modèles Statistiques, CNRS UMR 8626 - Bât. 100, Université Paris-Sud, 91405 Orsay cedex, France
Received: 21 February 2014
Accepted: 6 May 2014
We theoretically study heat transfer between two anisotropic nanoparticles in vacuum, and derive closed expressions in terms of the anisotropic dipole polarizabilities. We show that transfer between two small spheroids can be many times as large as the one for two spheres of same volumes. Such increase with anisotropy is also found for the heat emission of an isolated small spheroid. Furthermore, we observe a strong dependence of transfer on the relative orientation, yielding the interpretation as a heat transfer switch. The switch quality, given as the ratio of transfer in the “on” and “off” positions, is observed to be as large as 103 in the near field and even larger in the far field.
PACS: 12.20.-m – Quantum electrodynamics / 44.40.+a – Thermal radiation / 68.35.Ct – Interface structure and roughness
© EPLA, 2014
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