Infrared nanoscopy of dirac plasmons at the graphene-SiO₂ interface.

  title={Infrared nanoscopy of dirac plasmons at the graphene-SiO₂ interface.},
  author={Z Fei and Gregory O. Andreev and Wenzhong Bao and LingFeng Zhang and Alexander S McLeod and Chen Jun Wang and Margaret Stewart and Zeng Zhao and Gerardo Dominguez and Mark H. Thiemens and Michael M Fogler and Michael J. Tauber and Antonio H Castro-Neto and Chun Ning Lau and F Keilmann and Dimitri N. Basov},
  journal={Nano letters},
  volume={11 11},
We report on infrared (IR) nanoscopy of 2D plasmon excitations of Dirac fermions in graphene. This is achieved by confining mid-IR radiation at the apex of a nanoscale tip: an approach yielding 2 orders of magnitude increase in the value of in-plane component of incident wavevector q compared to free space propagation. At these high wavevectors, the Dirac plasmon is found to dramatically enhance the near-field interaction with mid-IR surface phonons of SiO(2) substrate. Our data augmented by… CONTINUE READING
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