Dark modes and field enhancements in dielectric dimers illuminated by cylindrical vector beams

The scattering response of high refractive index particles enables a rich variety of electromagnetic phenomena that are inaccessible with plasmonic particles. Here we investigate the response of dielectric dimer structures illuminated by radially and azimuthally polarized cylindrical vector beams. Using finite-difference time-domain simulations, we demonstrate significant modification of the scattering spectra of dimer antennas and reveal how the illumination condition gives rise to these spectra through manipulation of electric and magnetic mode hybridization. By appropriately combining dimer geometries and beam symmetries, we demonstrate coupling to high-Q dark quadrupole modes with exceptional magnetic intensity enhancements. This work exploits structured light as a powerful framework for manipulating multipolar phenomena in multiparticle dielectric resonators.