Nanofocusing in a tapered graphene plasmonic waveguide
Nanofocusing in a tapered graphene plasmonic waveguide
复制标题
锥形石墨烯等离子体波导中的纳米聚焦
DOI:
10.1088/2040-8978/17/6/065002
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发表时间:
2015-05
期刊:
影响因子:
--
通讯作者:
资剑
中科院分区:
文献类型:
--
作者:
资剑
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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