Real-space imaging of acoustic plasmons in large-area graphene grown by chemical vapor deposition

Sergey G. Menabde, In-Ho Lee, Sanghyub Lee, Heonhak Ha, Jacob T. Heiden, Daehan Yoo, Teun-Teun Kim, Tony Low, Young Hee Lee (), Sang-Hyun Oh () and Min Seok Jang ()
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Sergey G. Menabde: Korea Advanced Institute of Science and Technology (KAIST)
In-Ho Lee: University of Minnesota
Sanghyub Lee: Institute for Basic Science (IBS)
Heonhak Ha: Korea Advanced Institute of Science and Technology (KAIST)
Jacob T. Heiden: Korea Advanced Institute of Science and Technology (KAIST)
Daehan Yoo: University of Minnesota
Teun-Teun Kim: Institute for Basic Science (IBS)
Tony Low: University of Minnesota
Young Hee Lee: Institute for Basic Science (IBS)
Sang-Hyun Oh: University of Minnesota
Min Seok Jang: Korea Advanced Institute of Science and Technology (KAIST)

Nature Communications, 2021, vol. 12, issue 1, 1-7

Abstract: Abstract An acoustic plasmon mode in a graphene-dielectric-metal structure has recently been spotlighted as a superior platform for strong light-matter interaction. It originates from the coupling of graphene plasmon with its mirror image and exhibits the largest field confinement in the limit of a sub-nm-thick dielectric. Although recently detected in the far-field regime, optical near-fields of this mode are yet to be observed and characterized. Here, we demonstrate a direct optical probing of the plasmonic fields reflected by the edges of graphene via near-field scattering microscope, revealing a relatively small propagation loss of the mid-infrared acoustic plasmons in our devices that allows for their real-space mapping at ambient conditions even with unprotected, large-area graphene grown by chemical vapor deposition. We show an acoustic plasmon mode that is twice as confined and has 1.4 times higher figure of merit in terms of the normalized propagation length compared to the graphene surface plasmon under similar conditions. We also investigate the behavior of the acoustic graphene plasmons in a periodic array of gold nanoribbons. Our results highlight the promise of acoustic plasmons for graphene-based optoelectronics and sensing applications.

Date: 2021
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DOI: 10.1038/s41467-021-21193-5

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