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

Author

Listed:
  • 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
    Shanxi University)

  • Jingjun Xu

    (Nankai University)

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.

Suggested Citation

  • Ni Zhang & Weiwei Luo & Lei Wang & Jiang Fan & Wei Wu & Mengxin Ren & Xinzheng Zhang & Wei Cai & Jingjun Xu, 2022. "Strong in-plane scattering of acoustic graphene plasmons by surface atomic steps," Nature Communications, Nature, vol. 13(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-28614-z
    DOI: 10.1038/s41467-022-28614-z
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    References listed on IDEAS

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    2. Z. Fei & A. S. Rodin & G. O. Andreev & W. Bao & A. S. McLeod & M. Wagner & L. M. Zhang & Z. Zhao & M. Thiemens & G. Dominguez & M. M. Fogler & A. H. Castro Neto & C. N. Lau & F. Keilmann & D. N. Basov, 2012. "Gate-tuning of graphene plasmons revealed by infrared nano-imaging," Nature, Nature, vol. 487(7405), pages 82-85, July.
    3. G. X. Ni & A. S. McLeod & Z. Sun & L. Wang & L. Xiong & K. W. Post & S. S. Sunku & B.-Y. Jiang & J. Hone & C. R. Dean & M. M. Fogler & D. N. Basov, 2018. "Fundamental limits to graphene plasmonics," Nature, Nature, vol. 557(7706), pages 530-533, May.
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