纳米尺度机械形变调制的非接触热晶体管效应
Non-contact Thermal Transistor Effects Modulated by Nanoscale Mechanical Deformation
摘要：
由于能源的有限性和全球气候变暖的影响，热管理成为近年来研究的热点。在提高热能利用效率中的一个重要课题是如何控制热流，并且已经提出了热整流器，例如热晶体管，作为用于调节热流的单元。在这项工作中，一个可重构的非接触式热晶体管与二维光栅介绍。热晶体管由三部分组成：源极、栅极和漏极，栅极工作在二氧化钒的相变温度附近，二氧化钒是一种相变材料。结果表明，该单元具有明显的晶体管特性。由绝缘/金属态支持的表面声子/等离子体激元可以在纳米尺度上进行调制。当可拉伸聚二甲基硅氧烷受到拉伸或压缩时，动态放大因子范围为15.4至30.6。这一工作为研究由机械变形引起的可控小尺度热输运提供了理论依据。
英文摘要：
Thermal management has become a promising field in recent years due to the limitation of energy resources and the global warming. An important topic in improving the efficiency of thermal energy utilization is how to control the flows of heat, and thermal rectifiers, such as the thermal transistor, have been proposed as units for modulating the flow of heat. In this work, a reconfigurable non-contact thermal transistor with two-dimensional grating is introduced. The thermal transistor consists of three parts: source, gate, and drain, with the gate working around the phase-transition temperature of vanadium dioxide, a type of phase-transition material. Results show that the unit has a clear transistor-like behavior. The surface phonon/plasmon polaritons supported by the insulating/metallic states that contribute to the radiative thermal transport can be modulated at a nanoscale separation. And the dynamic amplification factor ranges from 15.4 to 30.6 when the stretchable polydimethylsiloxane is subjected to tension or compression. This work sheds light on studies about the controllable small-scale thermal transport due to mechanical deformations.
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