Kerker Condition for Enhancing Emission Rate and Directivity of Single Emitter Coupled to Dielectric Metasurfaces

摘要

Metasurfaces have the ability to control classical and non-classical statesof light to achieve controlled emission even at the level of a single emitter.Here, the Kerker condition induced emission rate enhancement with strongdirectivity is unveiled from a single emitter integrated within a dielectricmetasurface consisting of silicon nano-disks. The simulation and analyticalcalculations attest the Kerker condition with unidirectional light scatteringevolved by the constructive interference between electric dipole, toroidaldipole, and the magnetic quadrupole. The results evince spatially-dependentenhanced local density of optical states, which reciprocates localized fieldintensity. The emission rate enhancement of 400 times is achieved close tothe zero phonon line of the nitrogen-vacancy center with superior emissiondirectivity and collection efficiency. The results have implications in on-demandsingle photon generation, spin-photon interface, many-body interactions, andstrong coupling.