Enhanced energy transfer by near-field coupling of a nanostructured metamaterial with a graphene-covered plate
Enhanced energy transfer by near-field coupling of a nanostructured metamaterial with a graphene-covered plate
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DOI：
10.1016/j.jqsrt.2016.06.035
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发表时间：
2016-11-01
影响因子：
2.3
通讯作者：
Wang, Liping
中科院分区：
文献类型：
--
作者：
Chang, Jui-Yung;Yang, Yue;Wang, Liping
耦合的表面等离子体/声子极化激元和双曲模式已知可以增强纳米真空间隙的辐射传递，但通常需要相同的材料。对于近场热光伏和热整流等应用，实现不同材料之间的强近场能量传递变得至关重要。在这项工作中，我们从理论上证明了纳米结构的超材料发射器和石墨烯艾德平面接收器之间的近场辐射传输增强。在差距距离为20 nm时，近场耦合较强，光谱热流密度提高了两个数量级。通过仔细选择石墨烯化学势和硅纳米孔发射器和硅板接收器的掺杂水平，在400 K至300 K之间，总近场辐射热通量可以达到远场黑体极限的约500倍。通过近场表面等离子体激元耦合、涨落电动力学和色散关系阐明了其物理机制。详细分析了石墨烯化学势、发射极和接收极掺杂浓度以及真空间隙距离对近场耦合和辐射能量传递的影响。(C)2016爱思唯尔有限公司版权所有。
Coupled surface plasmon/phonon polaritons and hyperbolic modes are known to enhance radiative transfer across nanometer vacuum gaps but usually require identical materials. It becomes crucial to achieve strong near-field energy transfer between dissimilar materials for applications like near-field thermophotovoltaic and thermal rectification. In this work, we theoretically demonstrate enhanced near-field radiative transfer between a nanostructured metamaterial emitter and a graphene-cov&ed planar receiver. Strong near-field coupling with two orders of magnitude enhancement in the spectral heat flux is achieved at the gap distance of 20 nm. By carefully selecting the graphene chemical potential and doping levels of silicon nanohole emitter and silicon plate receiver, the total near-field radiative heat flux can reach about 500 times higher than the far-field blackbody limit between 400 K and 300 K. The physical mechanism is elucidated by the near-field surface plasmon coupling with fluctuational electrodynamics and dispersion relations. The effects of graphene chemical potential, emitter and receiver doping levels, and vacuum gap distance on the near-field coupling and radiative energy transfer are analyzed in detail. (C) 2016 Elsevier Ltd. All rights reserved.