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Edge and Surface Plasmons in Graphene Nanoribbons
Z Fei1,2, M D Goldflam1, J-S Wu1
1Department of Physics, University of California, San Diego , La Jolla, California 92093, United States.
Nano Letters
|November 17, 2015
Summary
We studied plasmon modes in graphene nanoribbons using nano-infrared imaging. Results show width-dependent patterns, field enhancement, and unique edge plasmons, offering insights into plasmonics.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Nanotechnology
Background:
- Graphene nanoribbons (GNRs) exhibit unique plasmonic properties due to quantum confinement.
- Understanding plasmon confinement is crucial for developing advanced optical devices.
Purpose of the Study:
- To investigate confined plasmon modes in patterned GNRs using nano-infrared (IR) imaging.
- To analyze the influence of ribbon width on plasmon patterns and field enhancement.
- To study the impact of substrate phonons on plasmon damping and observe edge plasmons.
Main Methods:
- Fabrication of GNRs using high-quality chemical-vapor-deposited (CVD) graphene on Al2O3 substrates.
- Nano-infrared (IR) imaging to visualize confined plasmon modes.
- Spectroscopic nanoimaging in the mid-infrared range (850–1450 cm⁻¹) to assess plasmon damping.
Main Results:
- Observed distinct plasmon mode patterns and strong field enhancement that systematically vary with GNR width.
- Evaluated the effect of substrate phonons on plasmon damping.
- Identified and characterized peculiar one-dimensional edge plasmons propagating along GNR edges.
Conclusions:
- The confined geometry of GNRs significantly influences plasmonic behavior, enabling tunable optical responses.
- Substrate phonon interactions play a role in plasmon damping in these nanostructures.
- Edge plasmons represent a novel mode of plasmon propagation in patterned graphene.
