Thermal radiation control from hot graphene electrons coupled to a photonic crystal nanocavity
Author(s)Shiue, Ren-Jye; Gao, Yuanda; Tan, Cheng; Peng, Cheng; Zheng, Jiabao; Efetov, Dmitri K.; Kim, Young Duck; Hone, James; Englund, Dirk R; ... Show more Show less
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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. Keywords: Nanophotonics and plasmonics; Optical properties and devices; Photonic crystals
DepartmentMassachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Springer Science and Business Media LLC
Shiue, Ren-Jye et al. "Thermal radiation control from hot graphene electrons coupled to a photonic crystal nanocavity.". Nature Communications 10 (January 2019): 109. © 2019, The Author(s).
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