Edge and Surface Plasmons in Graphene Nanoribbons

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• 作者：Z. Fei ; M. D. Goldflam ; J.-S. Wu ; S. Dai ; M. Wagner ; A. S. McLeod ; M. K. Liu ; K. W. Post ; S. Zhu ; G. C. A. M. Janssen ; M. M. Fogler ; D. N. Basov
• 刊名：Nano Letters
• 出版年：2015
• 出版时间：December 9, 2015
• 年：2015
• 卷：15
• 期：12
• 页码：8271-8276
• 全文大小：447K
• ISSN：1530-6992

文摘

We report on nano-infrared (IR) imaging studies of confined plasmon modes inside patterned graphene nanoribbons (GNRs) fabricated with high-quality chemical-vapor-deposited (CVD) graphene on Al₂O₃ substrates. The confined geometry of these ribbons leads to distinct mode patterns and strong field enhancement, both of which evolve systematically with the ribbon width. In addition, spectroscopic nanoimaging in the mid-infrared range 850鈥?450 cm^鈥? allowed us to evaluate the effect of the substrate phonons on the plasmon damping. Furthermore, we observed edge plasmons: peculiar one-dimensional modes propagating strictly along the edges of our patterned graphene nanostructures.