In the theory of radiative heat exchanges between two closely spaced bodies introduced by Polder and van Hove, no interplay between the heat carriers inside the materials and the photons crossing the separation gap is assumed. Here we release this constraint by developing a general theory to describe the conduction-radiation coupling between two solids of arbitrary size separated by a subwavelength separation gap. We show that, as a result of the temperature profile induced by the coupling with conduction, the radiative heat flux exchanged between two parallel slabs at nanometric distances can be orders of magnitude smaller than the one predicted by the conventional theory. These results could have important implications in the fields of nanoscale thermal management, near-field solid-state cooling, and nanoscale energy conversion.

中文翻译：

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两种紧密分离的固体之间的传导-辐射耦合

在Polder和van Hove提出的两个紧密间隔的物体之间的辐射热交换理论中，没有假设材料内部的热载体与穿过分离间隙的光子之间会发生相互作用。在这里，我们通过发展一个通用理论来释放这种约束，该通用理论描述了用亚波长分离间隙分离的任意大小的两个固体之间的传导-辐射耦合。我们表明，由于传导耦合引起的温度分布的结果，两个平行平板之间在纳米距离处交换的辐射热通量可以比传统理论预测的辐射热通量小几个数量级。这些结果可能会对纳米级热管理，近场固态冷却和纳米级能量转换产生重要影响。