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(Color online) Black curves show the dispersion relation for the nanowire plasmons for different . The energy increases with . The yellow lines show the discrete plasmon energies of a sphere for multipolar indices . The schematic below the curves illustrates the geometry of the structure.
(Color online) Schematics showing the hybridization of the continua of wire plasmons with discrete sphere plasmons for the three different polarizations: A polarization, B polarization, and C polarization shown at the bottom of each panel. The density of states of the wire plasmons is shown for (blue) and (red). The effective continuum is shown for (dark blue) and for (orange). The resulting hybridized plasmons are shown in black with lines indicating localized states and semicircles indicating virtual states. The dashed red lines indicate which states interact.
Absorption spectra of nanoparticle/thin wire system with , , and for different polarizations of the incident light: Dashed lines (A polarization), dot-dashed lines (B polarization), and dotted lines (C polarization). The solid line is the optical absorption for an isolated nanosphere. Panel (a) shows the absorption on a logarithmic scale over a wide range of frequencies using a damping parameter of . Panel (b) is a closeup on the absorption around the localized plasmon using a very small damping parameter of .
(Color online) Electric field enhancement near the sphere/wire system calculated from FDTD with periodic boundary conditions for A polarization. The upper panel is for and the lower panel is for . The geometries of the system and , , and . The PBC unit cell is . The dielectric function is Drude with and a damping of .
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