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Solid and hollow metallo-dielectric spheres are created by layer-by-layer self-assembly. The discrete metallic nanoparticles, which make up the shell, form a contiguous layer that exhibits a collective plasmon resonance with a splitting of the dipole mode into transverse and longitudinal modes. The splitting can be controlled by the number of self- assembled octa(3-aminopropyl)silsesquioxane (NSi8) capped Ag nanoparticle (see Figure) layers deposited.
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Cassagneau et al. (2002) studied this question.
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