非共振对相邻纳米结构间微米级间隙能量传递的贡献
Nonresonant contributions to energy transfer through micron-size gaps between neighboring nanostructures
摘要：
目前在纳米尺度上分析辐射热交换的理论方法是基于Rytov的随机电动力学。然而，这种方法在描述微尺度能量转移方面存在不足，因为它忽略了材料中不同弛豫模式之间的耦合所产生的非共振贡献。我们表明，通过对数正态分布的声子态密度占这样的模式耦合，并导致一个通用的表达式的传热系数，其中包括非共振的贡献。该表达式与已有的实验结果吻合得非常好。因此，我们的理论超越了随机电动力学，并提供了一个整体的解释，无论几何配置的能量转移通过微间隙。
英文摘要：
Current theoretical approaches to the analysis of radiative heat exchange at the nanoscale are based on Rytov's stochastic electrodynamics. However, this approach falls short in the description of microscale energy transfer since it overlooks non-resonant contributions arising from the coupling between different modes of relaxation in the material. We show that the phonon density of states given through a log-normal distribution accounts for such mode-coupling and leads to a general expression for the heat transfer coefficient which includes non-resonant contributions. This expression fits the existing experimental results with remarkable accuracy. Thus, our theory goes beyond stochastic electrodynamics and offers an overall explanation of energy transfer through micrometric gaps regardless of geometrical configurations.
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