基于非对称黑磷光栅的辐射热开关
Radiative thermal switch via asymmetric black phosphorus gratings
摘要：
纳米尺度下的热传导主动控制在热逻辑和能量转换器件中具有巨大的应用潜力。在目前的工作中，我们从理论上提出了一个辐射热开关（RTS）组成的一对非对称的黑磷（BP）光栅，与BP纳米带周期性图案在不同的方向。光栅之间的简单机械旋转能够实现近场辐射热传递的实质性调制，特别是当与使用不相同的参数（即，填充因子和电子密度。在包括非对称BP光栅、对称BP光栅和BP薄膜的所有情况中，我们发现非对称BP光栅具有最好的开关性能。优化的开关因子可以高达90%的真空分离d=50 nm和高于70%，即使在远场制度。高性能的开关基本上归因于两个非对称光栅的表面特性之间的可调谐匹配度。此外，由于扭转原理，RTS可以在任何温度下工作，这与基于相变材料的RTS相比具有很大的优势。所提出的开关方案在热管理和热电路中的应用具有重要意义。
英文摘要：
Active control of heat transfer at the nanoscale has great potentials in thermal logic and energy conversion devices. In the present work, we theoretically propose a radiative thermal switch (RTS) composed of a pair of asymmetric black phosphorus (BP) gratings, with BP nanoribbons periodically patterned in different directions. The simply mechanical rotation between the gratings enables substantial modulation of near-field radiative heat transfer, especially when combined with the use of non-identical parameters, i.e., filling factors and electron densities of BP. Among all the cases including asymmetric BP gratings, symmetric BP gratings, and BP films, we find that the asymmetric BP gratings possess the most excellent switching performance. The optimized switching factors can be as high as 90% with the vacuum separation d=50 nm and higher than 70% even in the far-field regime. The high-performance switching is basically attributed to the rotatable-tunable matching degree between the surface characteristics of the two asymmetric gratings. Moreover, due to the twisting principle, the RTS can work at any temperature, which has great advantage over the phase change materials-based RTS. The proposed switching scheme has great significance for the applications in thermal management and thermal circuits.
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