Enhancing thermal radiation by graphene-assisted hBN/SiO2 hybrid structures at the nanoscale
Enhancing thermal radiation by graphene-assisted hBN/SiO2 hybrid structures at the nanoscale
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DOI：
10.1364/oe.26.00a591
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发表时间：
2018-05-14
期刊：
影响因子：
3.8
通讯作者：
He, Sailing
中科院分区：
文献类型：
--
作者：
Shi, Kezhang;Liao, Ran;He, Sailing
提出并证明了石墨烯辅助的hBN/SiO2混合结构增强近场热辐射（NFTR）。由于hBN的双曲声子极化激元和SiO2的表面声子极化激元之间的互补性，在中红外波段，耦合模式可以显著提高光子隧穿几率，尤其是在石墨烯表面等离子体激元的辅助下。因此，热通量可以在10 nm的分离距离处超过黑体极限4个数量级，并且仅使用两层厚度各为20 nm的石墨烯-hBN多层达到无限极限的97%。第一个石墨烯层控制大部分的热通量，而其他层可用于调节和优化。讨论了化学势μ与差距距离d之间的动态关系。与现有的石墨烯-hBN三层结构相比，我们的石墨烯辅助的hBN/SiO2杂化结构的最佳热通量在不同d（从10 nm到1000 nm）下通过适当选择（mu（1），mu（2），mu（3））进一步平均增加了28.2%。(C)根据OSA开放获取出版协议的条款，2018年美国光学学会
A graphene-assisted hBN/SiO2, hybrid structure is proposed and demonstrated to enhance near-field thermal radiation (NFTR). Due to the complementarity between the hyperbolic phonon polaritons of hBN and the surface phonon polaritons of SiO2, at mid-infrared frequencies, coupling modes can remarkably improve the photon tunneling probability over a broad frequency band, especially when assisted by the surface plasmon polaritons of graphene sheets. Thus, the heat flux can exceed the blackbody limit by 4 orders of magnitude at a separation distance of 10 nm and reach 97% of the infinite limit of graphene-hBN multilayers using only two layers with a thickness of 20 nm each. The first graphene layer controls most of the heat flux, while the other layers can be used to regulate and optimize. The dynamic relationship between the chemical potential mu and the gap distance d are thoroughly discussed. Optimal heat flux of our graphene-assisted hBN/SiO2 hybrid structure with proper choices of (mu(1), mu(2), mu(3)) for different d (from 10 nm to 1000 nm) is further increased by 28.2% on average in comparison with the existing graphene-hBN triple-layer structure. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement