We address the possibility of atomic-scale control of the plasmon modes of graphene nanostructures. Using the time-dependent many-body approach we show that for the zigzag and armchair nanoribbons, the single carbon atom vacancy results in “on” and “off” switching of the longitudinal plasmon modes or in a change of their frequency. The effect stems from the robust underlying physical mechanism based on the strong scattering of the two-dimensional (2D) electrons on the vacancy defects in graphene lattice. Thus our findings establish a platform for optical response engineering or sensing in 2D materials.

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• Photoemission
• Plasmonics
• Graphene
• Nanoparticles
• Nanoribbon
• Two-dimensional electron system
• Nonperturbative methods
• Tight-binding model