Thermal radiation control from hot graphene electrons coupled to a photonic crystal nanocavity

Ren-Jye Shiue, Yuanda Gao, Cheng Tan, Cheng Peng, Jiabao Zheng, Dmitri K. Efetov, Young Duck Kim, James Hone and Dirk Englund ()
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Ren-Jye Shiue: Massachusetts Institute of Technology
Yuanda Gao: Columbia University
Cheng Tan: Columbia University
Cheng Peng: Massachusetts Institute of Technology
Jiabao Zheng: Massachusetts Institute of Technology
Dmitri K. Efetov: The Barcelona Institute of Science and Technology
Young Duck Kim: Columbia University
James Hone: Columbia University
Dirk Englund: Massachusetts Institute of Technology

Nature Communications, 2019, vol. 10, issue 1, 1-7

Abstract: Abstract 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.

Date: 2019
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DOI: 10.1038/s41467-018-08047-3

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