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Author: Raul Esquivel-Sirvent
Requested Type: Oral
Submitted: 2015-03-26 18:08:00

Co-authors: R. Hernandez-Rojas

Contact Info:
Instituto de Fisica, UNAM
Apdo Postal 20-364
Mexico, DF   01000

Abstract Text:
The near field heat transfer at the nanoscale is a purely electrodynamic phenomena described by Rytov's theory of fluctuating electromagnetic fields [1]. In the near field the main contribution to the heat transfer comes from evanescent waves [2].

In this work we present the tuning of near field heat transfer between local superlattices using a surface impedance approach to calculate the optical response of the superlattices. By choosing the periodicity and dielectric function of the constitutive materials the thermally emitted power can be modified both in magnitude and in frequency.

An additional control of the heat transfer is an external magnetic field via the excitation of magnetoplasmons. For example, parallel slabs made of III-V semi conductors such as InSb The external magnetic field, as we show in this work, tunes the heat flux reducing it as the magnetic field intensity increases. When an external magnetic field is applied, an optical anisotropy is induced that depends on the intensity of the magnetic field and its orientation. This causes a reduction of the reflection coefficients of the slabs and a reduction in the heat flux according to the Polder-van Hove equation for radiative heat transfer.

[1] E. A. Vinogradov and I. A. Dorofeyev, Thermally stimulated