多体系统中的辐射传热：耦合电和磁偶极子方法
Radiative heat transfer in many-body systems: coupled electric and magnetic dipole approach
摘要：
多体辐射传热理论[P. Ben-Abdallah，S.- A. Biehs和K. Joulain，Phys. Rev. Lett. 107，114301（2011）]仅考虑了来自电偶极矩的贡献。然而，对于金属颗粒，由于涡流产生的磁偶极矩起着重要的作用，它可以进一步与电偶极矩耦合以引入交叉项。在这项工作中，我们发展了耦合电和磁偶极子（CEMD）的方法在相互作用的对象的集合中的辐射传热。由于电磁相互作用的耦合，辐射热通量和局部能量密度主要由电磁、电磁、磁电和磁磁四项组成。采用CEMD方法研究了不同二聚体纳米粒子间的辐射传热。研究发现，这四项中的每一项都可以根据颗粒的位置和组成来控制辐射传热。此外，近场多体相互作用的CEMD研究考虑电介质和金属纳米粒子。当粒子处于耦合共振状态时，近场辐射热流密度和局部能量密度将大大增加。表面等离子体激元和表面声子激元可以相互耦合以增强辐射热通量。
英文摘要：
The many-body radiative heat transfer theory [P. Ben-Abdallah, S.-A. Biehs, and K. Joulain, Phys. Rev. Lett. 107, 114301 (2011)] only considered the contribution from the electric dipole moment. For metal particles, however, the magnetic dipole moment due to eddy current plays an important role, which can further couple with the electric dipole moment to introduce crossed terms. In this work, we develop coupled electric and magnetic dipole (CEMD) approach for the radiative heat transfer in a collection of objects in mutual interaction. Due to the coupled electric and magnetic interactions, four terms, namely the electric-electric, the electric-magnetic, the magnetic-electric and the magnetic-magnetic terms, contribute to the radiative heat flux and the local energy density. The CEMD is applied to study the radiative heat transfer between various dimers of nanoparticles. It is found that each of the four terms can dominate the radiative heat transfer depending on the position and composition of particles. Moreover, near-field many-body interactions are studied by CEMD considering both dielectric and metallic nanoparticles. The near-field radiative heat flux and local energy density can be greatly increased when the particles are in coupled resonances. Surface plasmon polariton and surface phonon polariton can be coupled to enhance the radiative heat flux.
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