Radiative heat transfer and radiative thermal energy for two-dimensional nanoparticle ensembles
Radiative heat transfer and radiative thermal energy for two-dimensional nanoparticle ensembles
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二维纳米粒子系综的辐射传热与辐射热能
DOI：
10.1103/physrevb.102.024203
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发表时间：
2020-04
影响因子：
3.7
通讯作者：
Minggang Luo;Junming Zhao;Linhua Liu;M. Antezza
中科院分区：
文献类型：
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作者：
Minggang Luo;Junming Zhao;Linhua Liu;M. Antezza
在多体辐射传热理论框架下研究了二维纳米粒子系综的辐射传热 (RHT) 和辐射热能 (RTE)。我们考虑由不同材料制成的纳米颗粒：金属 (Ag)、极性电介质 (SiC) 或绝缘体金属相变材料 (VO$_2$)。我们首先研究两个并行 2D 有限尺寸方晶格纳米颗粒集合之间的 RHT，特别关注多体相互作用 (MBI) 效应。我们系统地分析了表征 RHT 的不同物理状态。当 $p\ll \lambda_T$ 时，系统内部电磁场的多重散射会产生 MBI 状态。 MBI 效应以不同的方式表现出来，具体取决于 $d$：（a）如果 $d > \lambda_T$，由于每个 2D 系综内的纯系综内 MBI，总热导受到的影响较小，并且热导谱显示出一个单峰，尽管如此，该峰相对于两个孤立纳米粒子的典型峰有所偏移。 (b) 如果 $d < \lambda_T$，则存在强同时的系综内和系综间 MBI。在这种情况下，除了对热导谱有定性影响外，还对热导率产生直接的定量影响，现在显示出新的第二个峰值。至于 RTE，为了正确描述金属纳米颗粒发出的辐射，我们推导了坡印廷矢量的表达式，除了电矢量之外，还包括磁贡献。通过分析周期性和非周期性系综，我们表明单个二维纳米粒子系综发射的 RTE 对粒子分布敏感。例如，我们看到 2D 同心环配置系综发射的 RTE 在系综中心附近具有抑制特征。
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.