期刊
JOURNAL OF OPTICS
卷 17, 期 6, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/2040-8978/17/6/065002
关键词
graphene plasmonics; nanofocusing; waveguiding
类别
资金
- 973 Program [2013CB632701, 2011CB922004]
- NSFC
- Sino-Danish international network program [1370-00100B]
- Danish National Research Foundation [DNRF58]
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.
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