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

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

SUBMITTER: Menabde SG 

PROVIDER: S-EPMC7895983 | biostudies-literature | 2021 Feb

REPOSITORIES: biostudies-literature