Abstract
We present a theoretical calculation of the changes in the near field radiative heat transfer between two surfaces due to the presence of ultra thin metallic coatings on semiconductors. Depending on the substrates, the radiative heat transfer is modulated by the thickness of the ultra thin film. In particular we consider gold thin films with thicknesses varying from 4 to 20 nm. The ultra-thin film has an insulator-conductor transition close to a critical thickness of dc = 6.4 nm and there is an increase in the near field spectral heat transfer just before the percolation transition. Depending on the substrates (Si or SiC) and the thickness of the metallic coatings we show how the near field heat transfer can be increased or decreased as a function of the metallic coating thickness. The calculations are based on available experimental data for the optical properties of ultrathin coatings.
Highlights
Ultra thin metallic layers have physical properties that strongly depend on their thickness, in particular their conductivity, optical and magnetic properties.[1]
We take advantage of the metalinsulator percolation transition that occurs as a function of the film thickness
As a first case study we considered the heat transfer between a SiC half space and a Au coated Si substrate
Summary
R. Esquivel-Sirventa Instituto de Fısica, Universidad Nacional Autonoma de Mexico, Cd. de Mexico 01000, Mexico (Received 20 June 2016; accepted 9 September 2016; published online 19 September 2016)
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