Probing the limits of plasmonic enhancement using a two-dimensional atomic crystal probe

Wen Chen; Shunping Zhang; Meng Kang; Weikang Liu; Zhenwei Ou; Yang Li; Yexin Zhang; Zhiqiang Guan; Hongxing Xu

doi:10.1038/s41377-018-0056-3

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Probing the limits of plasmonic enhancement using a two-dimensional atomic crystal probe

Original Articles

- Probing the limits of plasmonic enhancement using a two-dimensional atomic crystal probe
- Light: Science & Applications Vol. 7, Issue 5, Pages: 531-541(2018)
- Affiliations：
  
  1.School of Physics and Technology, Center for Nanoscience and Nanotechnology, and Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education, Wuhan University, Wuhan, 430072, China
  2.The Institute for Advanced Studies, Wuhan University, Wuhan, 430072, China
- Author bio：
  
  Shunping Zhang (spzhang@whu.edu.cn)
  Hongxing Xu (hxxu@whu.edu.cn)
- Funds：
- DOI：10.1038/s41377-018-0056-3
  CLC：
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Chen, W. et al. Probing the limits of plasmonic enhancement using a two-dimensional atomic crystal probe. Light: Science & Applications, 5, 531-541 (2018).
DOI：

Chen, W. et al. Probing the limits of plasmonic enhancement using a two-dimensional atomic crystal probe. Light: Science & Applications, 5, 531-541 (2018). DOI： 10.1038/s41377-018-0056-3.

摘要

Abstract

Achieving larger electromagnetic enhancement using a nanogap between neighboring metallic nanostructures has been long pursued for boosting light–matter interactions. However, the quantitative probing of this enhancement is hindered by the lack of a reliable experimental method for measuring the local fields within a subnanometer gap. Here, we use layered MoS,2, as a two-dimensional atomic crystal probe in nanoparticle-on-mirror nanoantennas to measure the plasmonic enhancement in the gap by quantitative surface-enhanced Raman scattering. Our designs ensure that the probe filled in the gap has a well-defined lattice orientation and thickness, enabling independent extraction of the anisotropic field enhancements. We find that the field enhancement can be safely described by pure classical electromagnetic theory when the gap distance is no ,<, 1.24 nm. For a 0.62 nm gap, the probable emergence of quantum mechanical effects renders an average electric field enhancement of 114-fold, 38.4% lower than classical predictions.

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references

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