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

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Title
Real-space imaging of acoustic plasmons in large-area graphene grown by chemical vapor deposition
Author(s)
Menabde, Sergey G.; Lee, In-Ho; Sanghyub Lee; Ha, Heonhak; Heiden, Jacob T.; Yoo, Daehan; Teun-Teun Kim; Low, Tony; Young Hee Lee; Oh, Sang-Hyun; Jang, Min Seok
Publication Date
2021-02
Journal
NATURE COMMUNICATIONS, v.12, no.1
Publisher
NATURE RESEARCH
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. Acoustic graphene plasmons are superior to the graphene surface plasmons in field confinement and normalized propagation length, thus promising for applications. Here, the authors report near-field imaging of acoustic plasmons in high-quality CVD graphene, measure the AGP dispersion and propagation loss, and investigate their behavior in a periodic structure.
URI
https://pr.ibs.re.kr/handle/8788114/9486
DOI
10.1038/s41467-021-21193-5
ISSN
2041-1723
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > 1. Journal Papers (저널논문)
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