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arXiv 1207.0263cond-mat.mes-hall
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石墨烯和掺杂硅中表面等离子体激元引起的纳米级辐射热流的实验观察

Experimental observation of nanoscale radiative heat flow due to surface plasmons in graphene and doped silicon

P. J. van Zwol, S. Thiele, C. Berger, W. A. de Heer, J. Chevrier

摘要:

由于其二维电子结构,石墨烯表现出许多独特的性质。其中之一是在红外范围内的波矢量和温度依赖的等离子体。理论预测,由于这些等离子体激元,石墨烯可以用作通用材料,以增强任何介电衬底的纳米级辐射热交换。在这里,我们报告之间的辐射传热实验SiC和SiO2球具有非匹配的声子极化激元频率,因此只有弱的近场热交换。我们观察到,在SiC上外延生长的石墨烯的热通量贡献在短距离处占主导地位。等离子体激元对辐射传热的影响进一步支持与掺杂硅的测量。这些结果突出了石墨烯在光子近场和能量转换器件中的强大潜力。

英文摘要:

Owing to its two dimensional electronic structure, graphene exhibits many unique properties. One of them is a wave vector and temperature dependent plasmon in the infrared range. Theory predicts that due to these plasmons, graphene can be used as a universal material to enhance nanoscale radiative heat exchange for any dielectric substrate. Here we report on radiative heat transfer experiments between SiC and a SiO2 sphere which have non matching phonon polariton frequencies, and thus only weakly exchange heat in near field. We observed that the heat flux contribution of graphene epitaxially grown on SiC dominates at short distances. The influence of plasmons on radiative heat transfer is further supported with measurements for doped silicon. These results highlight graphenes strong potential in photonic nearfield and energy conversion devices.

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