Active Radiative Thermal Switching with Graphene Plasmon Resonators [electronic resource]

• Ngôn ngữ: eng
• Ký hiệu phân loại: 539.2 Radiation (Radiant energy)
• Thông tin xuất bản: Washington, D.C. : Oak Ridge, Tenn. : United States. Dept. of Energy. Office of Science ; Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2018
• Mô tả vật lý: Size: p. 2474-2481 : , digital, PDF file.
• Bộ sưu tập: Metadata
• ID: 255673
• Chủ đề: 1. 30 direct energy conversion; 2. 36 materials science; 3. 42 engineering; 4. 71 classical and quantum mechanics, general physics; 5. 77 nanoscience and nanotechnology; 6. Electrodes - solar; 7. Et al; 8. Phonons; 9. Solar (photovoltaic); 10. Solid state lighting; 11. Thermal conductivity

Tóm tắt

 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.