Nanofocusing in a tapered graphene plasmonic waveguide

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

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Abstrakt

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.
OriginalsprogEngelsk
Artikelnummer065002
TidsskriftJournal of Optics
Vol/bind17
Udgave nummer6
Antal sider5
ISSN2040-8978
DOI
StatusUdgivet - 2015
Udgivet eksterntJa

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