Strong in-plane scattering of acoustic graphene plasmons by surface atomic steps

Ni Zhang, Weiwei Luo, Lei Wang, Jiang Fan, Wei Wu, Mengxin Ren, Xinzheng Zhang, Wei Cai () and Jingjun Xu ()
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Ni Zhang: Nankai University
Weiwei Luo: Nankai University
Lei Wang: Xinyang Normal University
Jiang Fan: Nankai University
Wei Wu: Nankai University
Mengxin Ren: Nankai University
Xinzheng Zhang: Nankai University
Wei Cai: Nankai University
Jingjun Xu: Nankai University

Nature Communications, 2022, vol. 13, issue 1, 1-6

Abstract: Abstract Acoustic graphene plasmons (AGPs) have ultrastrong field confinement and low loss, which have been applied for quantum effect exploration and ångström-thick material sensing. However, the exploration of in-plane scattering of AGPs is still lacking, although it is essential for the manipulation of ultraconfined optical fields down to atomic level. Here, by using scattering-type scanning near-field optical microscopy (s-SNOM), we show that the mid-infrared AGPs can be strongly scattered by atomic level height steps, even though the step height of the scatterer is four orders of magnitude smaller than the incident free wavelength. This effect can be attributed to larger back scattering of AGPs than that of the traditional graphene plasmons. Besides, the scattering of AGPs by individual scatterers can be controlled via electrical back gating. Our work suggests a feasible way to control confined optical fields with atomic level height nanostructures, which can be used for ultra-compacted strong light–matter interactions.

Date: 2022
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DOI: 10.1038/s41467-022-28614-z

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