Super-Planckian thermal radiation enabled by coupled quasi-elliptic 2D black phosphorus plasmons

Super-Planckian thermal radiation enabled by coupled quasi-elliptic 2D black phosphorus plasmons
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准椭圆二维黑磷等离子体激元耦合实现超普朗克热辐射

DOI:
10.1016/j.applthermaleng.2018.08.081
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发表时间:
2018-11
影响因子:
6.4
通讯作者:
Huan He
Huan He
中科院分区:
工程技术2区
文献类型:
--
作者:
Jiadong Shen;Shu Guo;Xianglei Liu(刘向雷);Baoan Liu;Weitao Wu;Huan He

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新加入的二维层状材料-黑磷(BP),由于强的面内结构各向异性,表现出奇异的电学,光学和热学性质,而其热辐射性质仍在很大程度上未被探索。在这里,我们研究了单层/多层BP的近场热辐射,发现单层BP可以支持黑体上三个数量级的增强热交换,甚至超过优化的石墨烯片约18.5%。导出了耦合各向异性BP表面等离子体激元的色散关系,发现它与倏逝波的能量传输轮廓有很好的一致性。因此,突出的热辐射率可以归因于准椭圆BP SPP的激发,使其独特的结构各向异性和掺杂。随着层数的增加,近场辐射热通量单调减小。潜在的机制在于增加的虚部的光学电导率,但弱耦合高波矢光子。该工作有助于阐明单层/多层BP的近场热辐射机理,为新兴BP在非接触热管理和能量转换中的应用奠定了基础。
New-joined 2D layered material – black phosphorus (BP), due to strong in-plane structural anisotropy, has exhibited exotic electrical, optical, and thermal properties while its thermal radiative properties are still largely unexplored. Here, we investigate near-field thermal radiation of mono/multilayer BP, and find that monolayer BP can support three-order-of-magnitude enhanced heat exchange over blackbodies, even exceeding optimized graphene sheets by around 18.5%. We derive the dispersion relation of coupled anisotropic BP surface plasmon polaritons (SPPs), which is find to have a good agreement with the energy transmission contour of evanescent waves. The prominent thermal radiation rate thus can be attributed to the excitation of quasi-elliptic BP SPPs enabled by its unique structural anisotropy and doping. With increasing number of layers, near-field radiative heat flux decreases monotonously. The underlying mechanism lies in the increased imaginary part of optical conductivity but weak coupling with high-wavevector photons. This work helps elucidate the near-field thermal radiation mechanism of mono/multilayer BP, and paves the way for the application of emerging BP in noncontact thermal management and energy conversion.
DOI: --
发表时间: 2017
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