Self-Assembled Plasmonic Core-Shell Clusters with an Isotropic Magnetic Dipole Response in the Visible Range

We theoretically analyze, fabricate, and characterize a three-dimensional plasmonic nanostructure that exhibits a strong and isotropic magnetic response in the visible spectral domain. Using two different bottom-up approaches that rely on self-organization and colloidal nanochemistry, we fabricate clusters consisting of dielectric core spheres, which. are smaller than the wavelength of the incident radiation and are decorated by la large number of metallic nanospheres. Hence, despite having a complicated Inner geometry, sucho core shell particle is sufficiently small. to be. perceived as an individual object In the far field: The optical properties of such complex. plasmonic core shell particles are discussed for two different core diameters.