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arXiv 1509.08005cond-mat.mes-hall
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深亚波长区纳米结构间的近场辐射换热

Near-field radiative heat transfer between nanostructures in the deep sub-wavelength regime

Raphael St-Gelais, Linxiao Zhu, Shanhui Fan, Michal Lipson

摘要:

由深亚波长距离分开并受到大的热梯度(>100 K)的平行物体之间的辐射热传递可以实现发电和热传输控制的突破性技术。然而,由于难以在nm尺度的距离上保持大的热梯度,同时避免其他热传递机制,如传导,在这种情况下的热传输从未在实验上实现。以前的平行平面之间的实验测量仅限于大于500 nm的距离(具有20 K的热梯度),这远大于大多数应用所需的理论预测距离(<100 nm)。在这里,我们展示了近场辐射热传递之间的平行纳米结构在深亚波长制度,使用高精度微机电(MEMS)位移控制。我们还利用高拉伸应力下结构的高机械稳定性,以最大限度地减少热屈曲效应,并在大的热梯度下保持小的分离。我们实现了近两个数量级相对于远场极限,这对应于一个54 nm的分离的热传递的增强。我们还实现了冷热表面之间的高温度梯度(260 K),同时保持约100 nm的距离。

英文摘要:

Radiative heat transfer between parallel objects separated by deep sub-wavelength distances and subject to large thermal gradients (>100 K) could enable breakthrough technologies for electricity generation and thermal transport control. However, thermal transport in this regime has never been achieved experimentally due to the difficulty of maintaining large thermal gradients over nm-scale distances while avoiding other heat transfer mechanism such as conduction. Previous experimental measurement between parallel planes were limited to distances greater than 500 nm (with a 20 K thermal gradient), which is much larger than the theoretically predicted distance (<100 nm) required for most applications. Here we show near-field radiative heat transfer between parallel nanostructures in the deep sub-wavelength regime using high precision micro electromechanical (MEMS) displacement control. We also exploit the high mechanical stability of structures under high tensile stress to minimize thermal buckling effects and maintain small separations at large thermal gradients. We achieve an enhancement of heat transfer of almost two orders of magnitude relative to the far-field limit, which corresponds to a 54 nm separation. We also achieve a high temperature gradient (260 K) between the cold and hot surfaces while maintaining a ~100 nm distance.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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