2020/11/27 by Marvin M. Müller, Miriam Kosik, Marta Pelc +4 · 8 citations
Engineering · Materials Science · Physics and Astronomy · #Doping #Electron #Figure of merit #Gold and Silver Nanoparticles Synthesis and Applications #Graphene #Graphene research and applications #Metamaterial #Nanostructure #Plasmon #Plasmonic and Surface Plasmon Research #Resonance (particle physics) #cond-mat.mes-hall #physics.atm-clus #physics.optics
paper · pdf · doi:10.1063/5.0038883
published in Journal of Applied Physics 129(9) (American Institute of Physics) · The following article has been submitted to the Journal of Applied Physics
arxiv created 2020/11/27 · openalex created_date 2020/12/07 · openalex publication_date 2021/03/04 · arxiv updated 2021/03/31 · openalex updated_date 2026/08/06
Plasmonic nanostructures attract tremendous attention as they confine electromagnetic fields well below the diffraction limit while simultaneously sustaining extreme local field enhancements. To fully exploit these properties, the identification and classification of resonances in such nanostructures is crucial. Recently, a novel figure of merit for resonance classification has been proposed [Müller et al., J. Phys. Chem. C 124, 24331–24343 (2020)] and its applicability was demonstrated mostly to toy model systems. This novel measure, the energy-based plasmonicity index (EPI), characterizes the nature of resonances in molecular nanostructures. The EPI distinguishes between either a single-particle-like or a plasmonic nature of resonances based on the energy space coherence dynamics of the excitation. To advance the further development of this newly established measure, we present here its exemplary application to characterize the resonances of graphene nanoantennas. In particular, we focus on resonances in a doped nanoantenna. The structure is of interest, as a consideration of the electron dynamics in real space might suggest a plasmonic nature of selected resonances in the low doping limit but our analysis reveals the opposite. We find that in the undoped and moderately doped nanoantenna, the EPI classifies all emerging resonances as predominantly single-particle-like, and only after doping the structure heavily, the EPI observes plasmonic response.