期刊
NATURE COMMUNICATIONS
卷 10, 期 -, 页码 -出版社
NATURE RESEARCH
DOI: 10.1038/s41467-018-08047-3
关键词
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资金
- US Office of Naval Research [N00014-13-1-0662]
- Army Research Office [16112776]
- Stata Family Presidential Fellowship of MIT
- U.S. Army Research Office through the Institute for Soldier Nanotechnologies
- Semiconductor Research Corporation's NRI Center
- U.S. Department of Energy, Office of Basic Energy Sciences [DE-SC0012704]
- Centers for Excitonics
- Energy Frontier Research Center - Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0001088]
Controlling thermal radiation is central in a range of applications including sensing, energy harvesting, and lighting. The thermal emission spectrum can be strongly modified through the electromagnetic local density of states (EM LDOS) in nanoscale-patterned metals and semiconductors. However, these materials become unstable at high temperature, preventing improvements in radiative efficiency and applications such as thermophotovoltaics. Here, we report stable high-temperature thermal emission based on hot electrons (>2000 K) in graphene coupled to a photonic crystal nanocavity, which strongly modifies the EM LDOS. The electron bath in graphene is highly decoupled from lattice phonons, allowing a comparatively cool temperature (700 K) of the photonic crystal nanocavity. This thermal decoupling of hot electrons from the LDOS-engineered substrate opens a broad design space for thermal emission control that would be challenging or impossible with heated nanoscale-patterned metals or semiconductor materials.
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