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Active Radiative Thermal Switching with Graphene Plasmon Resonators
ACS Nano ( IF 15.8 ) Pub Date : 2018-03-12 00:00:00 , DOI: 10.1021/acsnano.7b08231 Ognjen Ilic , Nathan H. Thomas , Thomas Christensen 1 , Michelle C. Sherrott , Marin Soljačić 1 , Austin J. Minnich , Owen D. Miller 2 , Harry A. Atwater
ACS Nano ( IF 15.8 ) Pub Date : 2018-03-12 00:00:00 , DOI: 10.1021/acsnano.7b08231 Ognjen Ilic , Nathan H. Thomas , Thomas Christensen 1 , Michelle C. Sherrott , Marin Soljačić 1 , Austin J. Minnich , Owen D. Miller 2 , Harry A. Atwater
Affiliation
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We theoretically demonstrate a near-field radiative thermal switch based on thermally excited surface plasmons in graphene resonators. The high tunability of graphene enables substantial modulation of near-field radiative heat transfer, which, when combined with the use of resonant structures, overcomes the intrinsically broadband nature of thermal radiation. In canonical geometries, we use nonlinear optimization to show that stacked graphene sheets offer improved heat conductance contrast between “ON” and “OFF” switching states and that a >10× higher modulation is achieved between isolated graphene resonators than for parallel graphene sheets. In all cases, we find that carrier mobility is a crucial parameter for the performance of a radiative thermal switch. Furthermore, we derive shape-agnostic analytical approximations for the resonant heat transfer that provide general scaling laws and allow for direct comparison between different resonator geometries dominated by a single mode. The presented scheme is relevant for active thermal management and energy harvesting as well as probing excited-state dynamics at the nanoscale.
中文翻译：
石墨烯等离子体共振器的主动辐射热开关
我们从理论上证明了石墨烯谐振器中基于热激发表面等离子体激元的近场辐射热开关。石墨烯的高可调谐性可实现对近场辐射热传递的充分调制，当与谐振结构结合使用时，可克服热辐射的固有宽带特性。在规范几何结构中，我们使用非线性优化方法来显示堆叠的石墨烯片在“ ON”和“ OFF”切换状态之间提供了改善的导热对比，并且在隔离的石墨烯谐振器之间实现了比平行石墨烯片高> 10倍的调制。在所有情况下，我们都发现载流子迁移率是辐射热开关性能的关键参数。此外，我们得出了共振传热的形状不可知的解析近似值，该近似值提供了一般的缩放定律，并允许在以单一模式主导的不同共振器几何形状之间进行直接比较。所提出的方案与主动热管理和能量收集以及在纳米级探测激发态动力学有关。
更新日期：2018-03-12
中文翻译：
石墨烯等离子体共振器的主动辐射热开关
我们从理论上证明了石墨烯谐振器中基于热激发表面等离子体激元的近场辐射热开关。石墨烯的高可调谐性可实现对近场辐射热传递的充分调制，当与谐振结构结合使用时，可克服热辐射的固有宽带特性。在规范几何结构中，我们使用非线性优化方法来显示堆叠的石墨烯片在“ ON”和“ OFF”切换状态之间提供了改善的导热对比，并且在隔离的石墨烯谐振器之间实现了比平行石墨烯片高> 10倍的调制。在所有情况下，我们都发现载流子迁移率是辐射热开关性能的关键参数。此外，我们得出了共振传热的形状不可知的解析近似值，该近似值提供了一般的缩放定律，并允许在以单一模式主导的不同共振器几何形状之间进行直接比较。所提出的方案与主动热管理和能量收集以及在纳米级探测激发态动力学有关。
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