Near-field electromagnetic heat transfer through nonreciprocal hyperbolic graphene plasmons
Near-field electromagnetic heat transfer through nonreciprocal hyperbolic graphene plasmons
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通过非互易双曲石墨烯等离子体激元的近场电磁热传递
DOI：
10.1080/15567265.2020.1845884
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发表时间：
2020-10
影响因子：
4.1
通讯作者：
Yi Hong-Liang
中科院分区：
文献类型：
--
作者：
Zhou Cheng-Long;Yang Shui-Hua;Zhang Yong;Yi Hong-Liang
摘要本文从理论上证明了近场辐射换热（NFRHT）可以被一种新的倏逝波能量传输模式，即非互易双曲型表面等离子激元（NHSPPs）调制和增强。众所周知，通过将单层石墨烯片图案化为带状，石墨烯等离子体激元的闭环色散被打开，成为双曲线色散。当漂移电流作用于石墨烯带时，该双曲线模型将演化为极端不对称的形状，这在纳米尺度下的非接触热交换中从未被注意到。结合色散分布的分析，我们发现随着漂移速度的增加，双曲模表现出更加显著的非对称特性。研究还发现，在较大的间隙尺寸下，NHSPPs对NFRHT的增强作用会减弱。此外，还研究了光栅与漂移电流的耦合效应。通过改变化学势和石墨烯填充因子，可以调制模式的位置和强度，因此可以相应地调谐NFRHT。最后，我们发现，由于非互易双曲线拓扑的系统，在一个大的扭曲角，具有大的漂移电流速度的系统是更可取的调制NFRHT相比，零电流的情况下。总之，这些发现可能为高效的热管理，能量收集和亚波长热成像开辟了一条有前途的途径。
ABSTRACT In the present work, we theoretically demonstrate that near-field radiative heat transfer (NFRHT) can be modulated and enhanced by a new energy transmission mode of evanescent wave, i.e. the nonreciprocal hyperbolic surface plasmon polaritons (NHSPPs). It is well known that by patterning a single layer of graphene sheet into ribbons, the closed circular dispersion of graphene plasmons is opened to become hyperbolic one. When a drift current is applied to a graphene ribbon, this hyperbolic model would evolve into the extremely asymmetric shape, which has never been noted in the noncontact heat exchanges at nanoscale before. Combining the analysis of dispersion distribution, we find that as the drift velocity increases, the hyperbolic mode exhibits more significant asymmetric characteristics. It is also found that under a larger gap size, the enhanced effect of NHSPPs on NFRHT can be weakened. In addition, the coupling effect of grating and drift current is investigated simultaneously. By changing the chemical potential and graphene filling factor, the positions and intensities of the modes can be modulated, and hence the NFRHT can be tuned accordingly. Finally, we have found that thanks to the nonreciprocal hyperbolic topology of the system, at a large twisted angle, the system with a large drift current velocity is more preferable to modulate the NFRHT compared with the zero-current case. In summary, the findings may open a promising pathway for highly efficient thermal management, energy harvesting, and subwavelength thermal imaging.
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