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Theses

Conduction-radiation coupling at the nanoscale

Marta Reina 1
1 Laboratoire Charles Fabry / Nanophotonique
LCF - Laboratoire Charles Fabry
Abstract : Two bodies held at different temperatures experience a heat exchange mediated by photons, even when separated by vacuum. This radiative heat flux, limited by Stefan-Boltzmann's law in the far field (for distances larger than some microns at ambient temperatures), was predicted to exceed this limit even by several orders of magnitude for shorter distances, in the so-called near-field regime. Near-field radiative heat transfer has been largely studied theoretically, and several experiments have confirmed the theoretical predictions. Surprisingly, very few theoretical efforts have been devoted so far to the study of the coupling of radiative heat transfer and conduction in a solid body. We have recently shown that this coupling can indeed be relevant, and that it can produce a temperature gradient inside two interacting bodies.In this PhD thesis, we intend to explore theoretically this coupling, by means of several different approaches. The aim is both to understand how the two phenomena influence each other and to get an insight into the open question of the nanoscale frontier between radiative heat transfer and conduction. We will study the interplay between radiation and conduction by coupling the Boltzmann equation governing the transport of phonons inside a solid to the fluctuationnal electrodynamics which drives radiative heat exchanges. We also plan to include the role played by radiation-conduction coupling in the heat transport regimes within many-body systems. Finally, we will investigate the link between the Rytov theory of heat transfers induced by the thermal fluctuations and the conduction theory using an atomistic semi-ab-initio approach which takes into account the contribution of both acoustic and optical phonons. Apart from their fundamental interest, these works are relevant to describe nanoscale heat fluxes. Their understanding will allow to better describe energy exchanges in nanoscale devices.
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Submitted on : Tuesday, October 26, 2021 - 3:03:12 PM
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Marta Reina. Conduction-radiation coupling at the nanoscale. Optics [physics.optics]. Université Paris-Saclay, 2021. English. ⟨NNT : 2021UPAST098⟩. ⟨tel-03404212⟩

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