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Ultrafast Graphene Light Emitters

Author(s)
Kim, Young Duck; Gao, Yuanda; Shiue, Ren-Jye; Wang, Lei; Aslan, Ozgur; Bae, Myung-Ho; Kim, Hyungsik; Seo, Dongjea; Choi, Heon-Jin; Kim, Suk Hyun; Nemilentsau, Andrei; Low, Tony; Tan, Cheng Hock; Efetov, Dmitri; Taniguchi, Takashi; Watanabe, Kenji; Shepard, Kenneth L.; Heinz, Tony F.; Englund, Dirk R.; Hone, James; ... Show more Show less
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Abstract
Ultrafast electrically driven nanoscale light sources are critical components in nanophotonics. Compound semiconductor-based light sources for the nanophotonic platforms have been extensively investigated over the past decades. However, monolithic ultrafast light sources with a small footprint remain a challenge. Here, we demonstrate electrically driven ultrafast graphene light emitters that achieve light pulse generation with up to 10 GHz bandwidth across a broad spectral range from the visible to the near-infrared. The fast response results from ultrafast charge-carrier dynamics in graphene and weak electron-acoustic phonon-mediated coupling between the electronic and lattice degrees of freedom. We also find that encapsulating graphene with hexagonal boron nitride (hBN) layers strongly modifies the emission spectrum by changing the local optical density of states, thus providing up to 460% enhancement compared to the gray-body thermal radiation for a broad peak centered at 720 nm. Furthermore, the hBN encapsulation layers permit stable and bright visible thermal radiation with electronic temperatures up to 2000 K under ambient conditions as well as efficient ultrafast electronic cooling via near-field coupling to hybrid polaritonic modes under electrical excitation. These high-speed graphene light emitters provide a promising path for on-chip light sources for optical communications and other optoelectronic applications. Keywords: graphene; ultrafast light emitter; thermal radiation; van der Waals heterostructure; optoelectronics
Date issued
2018-01-22
URI
https://hdl.handle.net/1721.1/122921
Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Journal
Nano Letters
Publisher
American Chemical Society
Citation
Young Duck Kim et al. "Ultrafast Graphene Light Emitters." Nano Letters 18, 2 (January 2018): 934-940 © 2018 American Chemical Society
Version: Author's final manuscript
ISSN
1530-6984
1530-6992
Keywords
Mechanical Engineering, General Materials Science, Bioengineering, General Chemistry, Condensed Matter Physics

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