Abstract
The plasmon frequencies of a general core/double-shell structure are studied by plasmon hybridization method, and three distinct plasmon modes (ω0, ω+, and ω−) are found, in which the value of ω0 is always stable, and ω+ as well as ω− is variable with the radius ratios. The influences of dielectric effect and permittivity difference between metallic core and outer-shell are also analyzed thoroughly. The origins of the stability and tunability of this core/double-shell structure are explored by comparing the charge densities and local field distributions at interfaces. Furthermore, our model can be simplified to different structures including metallic-core/dielectric-shell, dielectric-core/metallic-shell, metallic-core/metallic-shell and its complementary structures, of which the corresponding plasmon modes are also studied and compared with experimental results.
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