Giant radiation heat transfer through micron gaps
Giant radiation heat transfer through micron gaps
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DOI：
10.1103/physrevb.84.195459
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发表时间：
2011-11-28
影响因子：
3.7
通讯作者：
Simovski, Constantin R.
中科院分区：
文献类型：
--
作者：
Nefedov, Igor S.;Simovski, Constantin R.
近场热传递在两个紧密间隔的介质之间可以超过通过单个黑体的界面的辐射的量级。这种效应是由指数衰减（倏逝）波引起的，它在两个透明边界或支持表面波的边界之间形成光子隧道。然而，在红外范围内，这种巨大的能量传递仅在两种介质之间的差距小到几十纳米的情况下才成立。我们提出了一种不同的辐射热传递的范例，这使得微米厚的间隙的强光子隧穿（从而巨大的辐射热传递）成为可能。对于它，两种介质之间的空气间隙应该被修改，以便将倏逝波在其内部转换为传播波。这种修改是可能的，而不增加两种介质之间的声子热导。所提出的包含纳米管或纳米线阵列的结构被设计成使得传递的热的光伏转换不会被这些阵列改变。
Near-field heat transfer between two closely spaced media can exceed in orders radiation through the interface of a single black body. This effect is caused by exponentially decaying (evanescent) waves, which form the photon tunnel between two transparent boundaries or boundaries supporting surface waves. However, in the infrared range this huge energy transfer holds only in the case when the gap between two media is as small as a few tens of nanometers. We propose a different paradigm of the radiation heat transfer, which makes possible the strong photon tunneling (and therefore giant radiative heat transfer) for micron-thick gaps. For it the air gap between two media should be modified, so that evanescent waves are transformed inside it into propagating ones. This modification is possible without increasing the phonon thermal conductance between two media. The suggested structure containing arrays of nanotubes or nanowires is designed so that the photovoltaic conversion of the transferred heat will not be altered by these arrays.