Radiative heat transfer and radiative thermal energy for 2D nanoparticle ensembles

Abstract

Radiative heat transfer (RHT) and radiative thermal energy (RTE) for 2D nanoparticle ensembles are investigated in the framework of many-body radiative heat transfer theory. We consider nanoparticles made of different materials: metals (Ag), polar dielectrics (SiC) or insulator-metallic phase-change materials (VO${}_2$). We start by investigating the RHT between two parallel 2D finite-size square-lattice nanoparticle ensembles, with particular attention to many-body interactions (MBI) effects. We systematically analyze the different physical regimes characterizing the RHT. When $p\ll {\lambda }_T$, a multiple scattering of the electromagnetic field inside the systems gives rise to a MBI regime. MBI effects manifest themselves in different ways, depending on $d$: (a) if $d>{\lambda }_T$, due to the pure intra-ensemble MBI inside each 2D ensemble, the total heat conductance is less affected, and the thermal conductance spectrum manifests a single peak which is nonetheless shifted with respect to the one typical of two isolated nanoparticles. (b) if $d<{\lambda }_T$, there is a strong simultaneous intra- and inter-ensemble MBI. In this regime there is a direct quantitative effect on the heat conductance, in addition to a qualitative effect on the thermal conductance spectrum which now manifests a new second peak. As for the RTE, to correctly describe the radiation emitted by metallic nanoparticles, we derive an expression of the Poynting vector including also magnetic contribution, in addition to the electric one. By analyzing both periodic and non-periodic ensembles, we show that the RTE emitted by a single 2D nanoparticle ensemble is sensitive to the particle distribution. As instance, we see that the RTE emitted by 2D concentric ring-configuration ensemble has an inhibition feature near the center of the ensemble.

20 pages, 21 figures

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• Long-range super-Planckian heat transfer between nanoemitters in a resonant cavity
• Normal heat diffusion in many-body system via thermal photons
• Near-field radiative heat transfer between shifted graphene gratings
• Many-body interaction on near-field radiative heat transfer between two nanoparticles caused by proximate particle ensembles
• Favorable and unfavorable many-body interactions for near-field radiative heat transfer in nanoparticle networks
• Generalized many-body approach for near-field radiative heat transfer between nonspherical dipoles
• Generalized coupled dipole method for thermal far-field radiation
• Near-field thermal emission from metasurfaces constructed of SiC ellipsoidal particles
• Gain-loss-engineering: a new platform for extreme anisotropic thermal photon tunneling
• Near-field focusing and amplification of tip-substrate radiative heat transfer