Active Temporal Control of Radiative Heat Transfer with Graphene Nanodisks
Active Temporal Control of Radiative Heat Transfer with Graphene Nanodisks
复制标题
DOI：
10.1103/physrevapplied.13.054054
复制
发表时间：
2020-05
影响因子：
4.6
通讯作者：
Lauren Zundel;A. Manjavacas
中科院分区：
文献类型：
--
作者：
Lauren Zundel;A. Manjavacas
动态控制纳米级热辐射传递的能力是开发多种技术的关键，从纳米级热管理系统到改进的热光伏设备。最近，石墨烯已成为实现这一目标的理想材料，因为它可以进行电掺杂以支持表面等离子体激元，即传导电子的集体振荡。这些共振产生大且光谱窄的光学横截面，这决定了石墨烯纳米结构的发射和吸收特性，从而决定了它与其他物体和环境辐射交换的热量。对于可达到的掺杂水平，石墨烯纳米结构支持的等离子体自然位于光谱的中红外部分，这是实际温度下辐射传热最相关的波长范围。此外，这些共振是主动可调的，从而提供对传热的完全动态控制。受这一巨大潜力的推动，我们对石墨烯纳米盘排列之间的辐射传热的时间演化进行了全面分析，表明可以利用这些结构的可调性来获得传统被动纳米结构不可能实现的主动控制传热场景。这项工作的结果为实现纳米级辐射传热的完全动态控制提供了一个框架，从而为该过程提供了基本的见解。
The ability to dynamically control the radiative transfer of heat at the nanoscale holds the key to the development of a diverse number of technologies, ranging from nanoscale thermal-management systems to improved thermophotovoltaic devices. Recently, graphene has emerged as an ideal material to achieve this goal, since it can be electrically doped to support surface plasmons, collective oscillations of the conduction electrons. These resonances produce large and spectrally narrow optical cross sections, which dictate the emission and absorption properties of the graphene nanostructure and, thus, the heat that it radiatively exchanges with other objects and the environment. For attainable levels of doping, the plasmons supported by graphene nanostructures naturally lie in the midinfrared part of the spectrum, which is the most relevant wavelength range for radiative heat transfer under realistic temperatures. Furthermore, these resonances are actively tunable, thus providing full dynamic control over the heat transfer. Motivated by this great potential, we present a comprehensive analysis of the temporal evolution of the radiative heat transfer between arrangements of graphene nanodisks, showing that it is possible to exploit the tunability of these structures to obtain actively controlled heat transfer scenarios not possible with conventional passive nanostructures. The results of this work provide a framework for achieving fully dynamical control over nanoscale radiative heat transfer and thus provide fundamental insights into this process.