Effects of edge on graphene plasmons as revealed by infrared nanoimaging

Qingyang Xu; Teng Ma; Mohammad Danesh; Bannur Nanjunda Shivananju; Sheng Gan; Jingchao Song; Cheng-Wei Qiu; Hui-Ming Cheng; Wencai Ren; Qiaoliang Bao

doi:10.1038/lsa.2016.204

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Effects of edge on graphene plasmons as revealed by infrared nanoimaging

Original Articles

- Effects of edge on graphene plasmons as revealed by infrared nanoimaging
- Light: Science & Applications Vol. 6, Issue 1, (2017)
- Affiliations：
  
  1.Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, 199 Ren-ai Road, Suzhou 215123, Jiangsu, China
  2.Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China
  3.Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore 117583, Singapore
  4.Department of Materials Science and Engineering, Monash University, Clayton, Victoria 3800, Australia
- Author bio：
  
  W Ren, Email: wcren@imr.ac.cn
  Q Bao, Email: qlbao@suda.edu.cn
- Funds：
- DOI：10.1038/lsa.2016.204
  CLC：
- Published：2017-03，
  
  Published Online：23 August 2016，
  
  Received：23 February 2016，
  
  Revised：01 July 2016，
  
  Accepted：14 August 2016
- Accepted：
Scan QR Code
Xu, Q. Y. et al. Effects of edge on graphene plasmons as revealed by infrared nanoimaging. Light: Science & Applications, 6, e16204 (2017).
DOI：

Xu, Q. Y. et al. Effects of edge on graphene plasmons as revealed by infrared nanoimaging. Light: Science & Applications, 6, e16204 (2017). DOI： 10.1038/lsa.2016.204.

摘要

Abstract

We used scattering-type scanning near-field optical microscopy (s-SNOM) to investigate the plasmonic properties of edges in well-defined graphene nanostructures

including sharp tapers

nanoribbons and nanogaps

which were all fabricated via the growth-etching chemical vapor deposition (GECVD) method. The obtained near-field images revealed the localized

plasmon modes along the graphene nanoribbon; these modes strongly depended on the size of the graphene pattern

the angle of the tapered graphene and the infrared excitation wavelength. These interesting plasmon modes were verified by numerical simulations and explained by the reflection

and interference of electromagnetic waves at the graphene–SiO

edge. The constructive interference at the graphene nanogap caused by charge accumulation was demonstrated for the first time. Using the infrared nanoimaging technique

greater plasmon broadening was observed in the zigzag edge than in the armchair edge. Our study suggests that graphene edges should be separated by an effective working distance to avoid the overlapping of localized plasmon modes

which is very important for the design of graphene-based plasmonic circuits and devices.

关键词

Keywords

edge chiralitygraphenegraphene plasmonnanoribbonnanogapnear-field microscopys-SNOM

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