Journal
NANO LETTERS
Volume 15, Issue 12, Pages 8271-8276Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b03834
Keywords
Graphene nanoribbons; CVD graphene; nano-infrared imaging; plasmon-phonon coupling; edge plasmons
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Funding
- ONR
- AFOSR
- Gordon and Betty Moore Foundation's EPiQS Initiative [GBMF4533]
- Delft Centre for Materials
- Delft Energy Initiative Fund
- Foundation for Fundamental Research on Matter (FOM)
- Netherlands Organisation for Scientific Research (NWO)
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We report on nano-infrared (IR) imaging studies of confined plasmon modes inside patterned graphene nanoribbons (GNRs) fabricated with high-quality chemical-vapordeposited (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 850-1450 cm(-1) 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.
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