 |
 |
Journal articles
Thermal conductivity of nano-layered systems due to surface phonon-polaritons
Abstract : The effective thermal conductivity of a layered system due to the propagation of surface phonon-polaritons is studied. We analytically demonstrate that the thermal conductivity of a set of nanolayers can be described as one of a single layer with an effective permittivity, which does not ordinarily appear in nature and depends on the permittivities and thicknesses of the individual components. For a two-layer system of SiO 2 and BaF 2 surrounded by air, it is shown that: (i) the propagation length of surfaces phonon-polaritons can be as high as 3.3 cm for a 200 nm-thick system. (ii) The thermal conductivity of the system with total thickness of 50 nm is 3.4 W/mÁK, which is twice that of a single layer of SiO 2 , at 500 K. Higher values are found for higher temperatures and thinner layers. The results show that an ensemble of layers provides more channels than a single layer for the propagation of surface phonon-polaritons and therefore for the enhancement of the thermal conductivity of common polar materials. V C 2014 AIP Publishing LLC. [http://dx.doi.org/10.1063/1.4864430]
Cited literature [15 references]
https://hal-ecp.archives-ouvertes.fr/hal-01134042
Contributor : Jose Ordonez-Miranda <>
Submitted on : Tuesday, March 24, 2015 - 3:55:36 PM
Last modification on : Wednesday, September 16, 2020 - 5:07:35 PM
Long-term archiving on: : Wednesday, November 9, 2016 - 9:47:13 AM
Contributor : Jose Ordonez-Miranda <>
Submitted on : Tuesday, March 24, 2015 - 3:55:36 PM
Last modification on : Wednesday, September 16, 2020 - 5:07:35 PM
Long-term archiving on: : Wednesday, November 9, 2016 - 9:47:13 AM
File
JAP.115.054311.pdf
Publisher files allowed on an open archive