Controlling the directivity of all-dielectric nanoantennas excited by integrated quantum emitters

We study the scattering properties of individual Al0.18Ga0.82AsAl0.18Ga0.82As nanocylinders, which support simultaneously electric and magnetic dipole resonances, excited by an integrated point dipole emitter. We show that by controlling the emitter position in the nanocylinder, it is possible to enhance directivity and the decay rate. Our findings reveal remarkable details of the emitter/antenna coupling mechanisms, opening the way to new design strategies for integrated systems used in nanosensing, quantum optics, and metamaterials.