Phase Resolved Surface Plasmon Interferometry of Graphene

Abstract

The surface plasmon polaritons (SPP) of graphene reflect the microscopic spatial variations of underlying electronic structure and dynamics. Access to this information requires probing the full SPP response function. We image the graphene SPP phase and amplitude by combining scanning probe tip coupled surface plasmon interferometry with phase resolved near-field signal detection. We show that a simple analytical cavity model can self-consistently describe the phase and amplitude response both for edge, grain boundary, and defect SPP reflection and scattering. The derived complex SPP wavevector, damping, and carrier mobility agree with the results from more complex models. This phase information opens a new degree of freedom for spatial and spectral graphene SPP tuning and modulation for opto-electronics applications.

5 pages, 6 figures

References in corpus (7)

• The electronic properties of graphene
• Two Dimensional Atomic Crystals
• Graphene plasmonics
• Dielectric function, screening, and plasmons in 2D graphene
• Manipulating infrared photons using plasmons in transparent graphene superlattices
• Mid-infrared plasmons in scaled graphene nanostructures
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Cited by in corpus (3)

• Highly confined low-loss plasmons in graphene-boron nitride heterostructures
• Plasmon losses due to electron-phonon scattering: the case of graphene encapsulated in hexagonal Boron Nitride
• Electronic response of graphene to linelike charge perturbations