Nanofocusing in a tapered graphene plasmonic waveguide

Yunyun Dai, Xiaolong Zhu, N. Asger Mortensen, Jian Zi, Sanshui Xiao

Research output: Contribution to journalJournal articleResearchpeer-review


Gated or doped graphene can support plasmons making it a promising plasmonic material in the terahertz regime. Here, we show numerically that in a tapered graphene plasmonic waveguide mid- and far-infrared light can be focused in nanometer scales, far beyond the diffraction limit. The underlying physics lies in that when propagating along the direction towards the tip both the group and phase velocities of the plasmons supported by the tapered graphene waveguide are reduced accordingly, eventually leading to nanofocusing at the tip with a huge enhancement of optical fields. The nanofocusing of optical fields in tapered graphene plasmonic waveguides could be potentially exploited in the enhancement of light–matter interactions.
Original languageEnglish
Article number065002
JournalJournal of Optics
Issue number6
Number of pages5
Publication statusPublished - 2015


  • Graphene plasmonics
  • Nanofocusing
  • Waveguiding


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