Magnetic fano resonances in all-dielectric nanocomplexes under cylindrical vector beams excitation

We report on the study of magnetic responses of azimuthally and radially excited all-dielectric symmetric and antisymmetric nanoassemblies. Our studies show that magnetic Fano resonances (FRs) in the optical wavelengths can be excited in silicon nanoparticle assemblies when illuminated by cylindrical vector beams. We present the underlying mechanism by investigating the generation of hot and coldspots in the gap regions between silicon particles. This work proposes promising methods to induce various types of magnetic resonant modes in all-dielectric nanostructures with high efficiency and without breaking the symmetry under the illumination of cylindrical vector beams.