Surface-plasmon resonances of arbitrarily shaped nanometallic structures in the small-screening-length limit

Abstract

According to the hydrodynamic Drude model, surface-plasmon resonances of metallic nanostructures blueshift owing to the nonlocal response of the metal's electron gas. The screening length characterising the nonlocal effect is often small relative to the overall dimensions of the metallic structure, which enables us to derive a coarse-grained nonlocal description using matched asymptotic expansions; a perturbation theory for the blueshifts of arbitrary shaped nanometallic structures is then developed. The effect of nonlocality is not always a perturbation and we present a detailed analysis of the "bonding" modes of a dimer of nearly touching nanowires where the leading-order eigenfrequencies and eigenmode distributions are shown to be a renormalisation of those predicted assuming a local metal permittivity.

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• Overcoming the bottleneck for quantum computations of complex nanophotonic structures: Purcell and FRET calculations using a rigorous mode hybridization method
• Plasmonic modes in cylindrical nanoparticles and dimers
• Plasmonic resonances of slender nanometallic rings
• A Universal Self-Amplification Channel for Surface Plasma Waves
• Possible self-amplification channel for surface plasma waves
• Theory of non-retarded ballistic surface plasma waves in metal films
• Possible Instability of the Fermi sea of metals against surface plasma oscillations