Heat radiation and transfer for point particles in arbitrary geometries

Abstract

We study heat radiation and heat transfer for pointlike particles in a system of other objects. Starting from exact many-body expressions found from scattering theory and fluctuational electrodynamics, we find that transfer and radiation for point particles are given in terms of the Green's function of the system in the absence of the point particles. These general expressions contain no approximation for the surrounding objects. As an application, we compute the heat transfer between two point particles in the presence of a sphere of arbitrary size and show that the transfer is enhanced by several orders of magnitude through the presence of the sphere, depending on the materials. Furthermore, we compute the heat emission of a point particle in front of a planar mirror. Finally, we show that a particle placed inside a spherical mirror cavity does not radiate energy.

14 pages, 9 figures (v2: Sec. IIIE was added; explanation of Eq. (29) was added; sentence in Acknowledgments was added; Ref. [69] was added; minor changes in text)

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• Radiative heat transfer between nanostructures
• Radiative heat transfer between metallic nanoparticles
• Non-equilibrium Fluctuational Quantum Electrodynamics: Heat Radiation, Heat Transfer, and Force
• Radiative heat transfer in many-body systems: coupled electric and magnetic dipole approach
• Hyperbolic waveguide for long-distance transport of near-field heat flux
• Radiative Heat Transfer in Anisotropic Many-Body Systems: Tuning and Enhancement
• Many body heat radiation and heat transfer in the presence of a non-absorbing background medium
• Small distance expansion for radiative heat transfer between curved objects
• Casimir potential of a compact object enclosed by a spherical cavity

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