Many efforts have been dedicated to enhancing the near-field radiative heat transfer by designing different kinds of geometric shapes or introducing new materials. Besides just improving the heat transfer rate, active and convenient thermal management is also important in micro/nano thermal systems. We show that introducing an intermediate modulator, based on the graphene/hBN/graphene heterostructure, can enhance and manipulate thermal radiative heat transfer without changing the distance or other parameters of the emitter and absorber. Such three-body systems can increase the radiatively exchanged power several times over corresponding two-body counterparts. The introduced modulator can be viewed as a mid-repeater to effectively enhance photon tunneling through evanescent modes. Furthermore, the heat transfer rate could be modulated in a large range and even be lower than two-body systems by applying bias voltages. The mechanism can be explained by the change of energy transmission coefficients between bodies through adjusting the optical properties of graphene. The presented scheme may open a new avenue to actively control near-field heat transfer at the micro/nanoscales.

中文翻译：

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使用中间调制器增强和控制近场辐射传热

通过设计不同种类的几何形状或引入新材料，人们致力于提高近场辐射热传递。除了提高传热速率，主动和方便的热管理在微/纳米热系统中也很重要。我们表明，引入基于石墨烯/ hBN /石墨烯异质结构的中间调制器，可以在不改变发射器和吸收器的距离或其他参数的情况下增强和操纵热辐射传热。这样的三体系统可以使辐射交换的功率比相应的两体系统增加几倍。可以将引入的调制器视为中继器，以有效增强通过through逝模的光子隧穿。此外，通过施加偏置电压，可以在较大范围内调节传热速率，甚至低于两体系统。可以通过调节石墨烯的光学性质来改变主体之间的能量传输系数，从而解释这种机理。提出的方案可以开辟一条新途径，以主动控制微米/纳米尺度的近场热传递。