• 文献标题:   Active Radiative Thermal Switching with Graphene Plasmon Resonators
  • 文献类型:   Article
  • 作  者:   ILIC O, THOMAS NH, CHRISTENSEN T, SHERROTT MC, SOLJACIC M, MINNICH AJ, MILLER OD, ATWATER HA
  • 作者关键词:   graphene, thermal radiation, nearfield radiative heat transfer, surface plasmon
  • 出版物名称:   ACS NANO
  • ISSN:   1936-0851 EI 1936-086X
  • 通讯作者地址:   CALTECH
  • 被引频次:   16
  • DOI:   10.1021/acsnano.7b08231
  • 出版年:   2018

▎ 摘  要

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 >10x 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.