Plasmonic modes in nanowire dimers: A study based on the hydrodynamic Drude model including nonlocal and nonlinear effects

Abstract

A combined analytical and numerical study of the modes in two distinct plasmonic nanowire systems is presented. The computations are based on a Discontinuous Galerkin Time-Domain approach and a fully nonlinear and nonlocal hydrodynamic Drude model for the metal is utilized. In the linear regime, these computations demonstrate the strong influence of nonlocality on the field distributions as well as on the scattering and absorption spectra. Based on these results, second-harmonic generation efficiencies are computed over a frequency range that covers all relevant modes of the linear spectra. In order to interprete the physical mechanisms that lead to corresponding field distributions, the associated linear quasi-electrostatic problem is solved analytically via conformal transformation techniques. This provides an intuitive classification of the linear excitations of the systems that is then applied to the full Maxwell case. Based on this classification, group theory facilitates the determination of the selection rules for the efficient excitation of modes, both in the linear and the nonlinear regime. This leads to significantly enhanced second-harmonic generation via judiciously exploiting the system symmetries. These results regarding the mode structure and second-harmonic generation are of direct relevance to other nano-antenna systems.

arXiv comment11 pages, 9 figures, including Supplemental Material

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Cited by in corpus (11)

• Modal analysis for nanoplasmonics with nonlocal material properties
• Surface second-harmonic from metallic nanoparticle configurations - a transformation optics approach
• Halevi's extension of the Euler-Drude model for plasmonic systems
• Nonadditive Enhancement of Nonequilibrium Atom-Surface Interactions
• Hydrodynamic acoustic plasmon resonances in semiconductor nanowires and their dimers
• Quantum thermodynamics of overdamped modes in local and spatially dispersive materials
• Extended hydrodynamic description for nonequilibrium atom-surface interactions
• A nested hybridizable discontinuous Galerkin method for computing second-harmonic generation in three-dimensional metallic nanostructures
• High-accuracy Casimir-Polder force calculations using the Discontinuous Galerkin Time-Domain method
• Theory of radial oscillations in metal nanoparticles driven by optically induced electron density gradients
• Nonlocal electrodynamics of two-dimensional anisotropic magneto-plasmons