Photonic nanostructures made of a dielectric sphere covered with many metallic particles are a basic building block for optical metamaterials with a magnetic response. To tune the properties of the system spheres covered with metallic nanorods of variable aspect ratio. Full-wave optical simulations using JCMsuite support the spectroscopic characterization.
R. Grillo, et al. Self-Assembled Arrays of Gold Nanorod-Decorated Dielectric Microspheres with a Magnetic Dipole Response in the Visible Range for Perfect Lensing and Cloaking Applications. ACS Appl. Nano Mater. 3(6), 6108 (2020).