Probing Graphene's Nonlocality with Singular Metasurfaces

Abstract

Singular graphene metasurfaces, conductivity gratings realized by periodically suppressing the local doping level of a graphene sheet, have recently been proposed to efficiently harvest THz light and couple it to surface plasmons over broad absorption bands, achieving remarkably high field enhancement. However, the large momentum wavevectors thus attained are sensitive to the nonlocal behaviour of the underlying electron liquid. Here, we extend the theory of singular graphene metasurfaces to account for the full nonlocal optical response of graphene and discuss the resulting impact on the plasmon resonance spectrum. Finally, we propose a simple local analogue model that is able to reproduce the effect of nonlocality in local-response calculations by introducing a constant conductivity offset, which could prove a valuable tool in the modelling of more complex experimental graphene-based platforms.

8 pages, 5 figures

References in corpus (9)

• Graphene plasmonics
• Graphene Plasmonics for Terahertz to Mid-Infrared Applications
• Mid-Infrared Plasmonic Biosensing with Graphene
• Graphene field effect transistors as room-temperature Terahertz detectors
• Mid-infrared plasmons in scaled graphene nanostructures
• Nonlocal optical response in metallic nanostructures
• Plasmonics in Atomically-Thin Crystalline Silver Films
• Electrically controlled terahertz magneto-optical phenomena in continuous and patterned graphene
• Nonlocal effects in singular plasmonic metasurfaces

Cited by in corpus (1)

• Nonlocal effects in plasmonic metasurfaces with almost touching surfaces