Generalized many-body approach for near-field radiative heat transfer between nonspherical dipoles

Abstract

A generalized fluctuational electrodynamics-based many-body approach for calculating near-field radiative heat transfer (NFRHT) between nonspherical dipoles is proposed. The geometric parameters of nonspherical dipoles are implemented in the definition of the self-term of the free-space Green's function. Dipole polarizability is defined a posteriori from the free-space Green's function solution such that polarizability calculation is an optional post-processing step rather than a required input. Both strong and weak forms of the generalized many-body approach are presented. It is shown that the approximate weak form is less computationally expensive but is only applicable to small particles characterized by size parameters less than ~0.24. The generalized many-body method is compared against an analytical solution for NFRHT between two spheroidal dipoles. A good agreement is obtained, and the small discrepancies are ascribed to differences in approximations for multiple reflections. The generalized many-body method is then applied to analyze the near-field spectral conductance between two SiC ellipsoidal dipoles. Results reveal that changes in the orientation of one of the ellipsoidal dipoles lead to active tuning of localized surface phonon resonance by up to three orders of magnitude. Finally, the spectral radiative thermal conductivity of a metamaterial composed of 1000 SiO2 ellipsoidal particles is studied. The metamaterial displays anisotropic radiative thermal conductivity, with resonance values differing by up to a factor of 2.8 between different directions. The generalized many-body model of NFRHT presented in this paper may be used to develop particle-based metamaterials with novel, engineered radiative thermal properties.

arXiv comment46 pages, 8 figures, 1 supplemental figure

References in corpus (29)

• Surface Electromagnetic Waves Thermally Excited: Radiative Heat Transfer, Coherence Properties and Casimir Forces Revisited in the Near Field
• Near-field Radiative Heat Transfer in Many-Body Systems
• Many-body radiative heat transfer theory
• Trace formulae for non-equilibrium Casimir interactions, heat radiation and heat transfer for arbitrary objects
• Non-equilibrium electromagnetic fluctuations: Heat transfer and interactions
• Fluctuational-electrodynamic theory and dynamics of heat transfer in multiple dipolar systems
• Fluctuating surface-current formulation of radiative heat transfer: theory and applications
• Fluctuating surface-current formulation of radiative heat transfer for arbitrary geometries
• Radiative heat transfer in many-body systems: coupled electric and magnetic dipole approach
• 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
• Thermal radiation in systems of many dipoles
• Convergence analysis of the thermal discrete dipole approximation
• Radiative Heat Transfer in Fractal Structures
• Radiative heat transfer and radiative thermal energy for 2D nanoparticle ensembles
• Multi-tip near-field scanning thermal microscopy
• Collective Near-Field Thermal Emission from Polaritonic Nanoparticle Arrays
• Radiative heat transfer between metallic nanoparticle clusters in both near field and far field
• Heat transfer between anisotropic nanopartricles: Enhancement and switching
• Near-field radiative heat transfer between twisted nanoparticle gratings
• Near-field radiative heat transfer between irregularly shaped dielectric particles modeled with the discrete system Green's function method
• Three-body radiation dynamics in systems with anisotropic nanoparticles
• Thermal radiative energy exchange between a closely-spaced linear chain of spheres and its environment
• Quantum Langevin equation approach to electromagnetic energy transfer between dielectric bodies in an inhomogeneous environment
• Radiative heat transfer between nanoparticles: shape dependence and three-body effect
• Orientation effects on near-field radiative heat transfer between complex-shaped dielectric particles
• Near-Field Thermal Emission by Periodic Arrays
• 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