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(a) Plasmonic modes evaluated from simulated extinction spectra for increasing aspect ratios for gold nanorod overgrowth with silver (solid lines) and pure silver cuboid (intersected lines). (b) Plasmonic modes (surface charge distribution) of the gold nanorod, Au@Ag cuboid, and pure silver cuboid relative to their excitation wavelength. (c) Electric field distribution of transversal modes of the Au@Ag cuboid. The edge rounding was fixed to 8%.
