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Benefiting from their low-loss light manipulation at subwavelength scales,optically resonant dielectric nanostructures have emerged as one of the mostpromising nanophotonic building blocks. Here, we theoretically conceive adielectric nanocavity made of moderate-refractive-index gallium nitride andinvestigate the strong electromagnetic field confinement inside the nanocavity.We demonstrate that gallium nitride nanodisks can support anapole states, whichresult from interference between electric dipole and toroidal dipole modes andare tunable by changing sizes of the nanodisks. The highly confinedelectromagnetic field of the anapole states can promote the emission efficiencyof a single quantum emitter inside the nanocavity. Moreover, the emissionpolarization can be tuned by placing the quantum emitter off the nanodiskcenter. Our findings provide a promising candidate for the construction ofultra-compact, super-radiative integrated quantum light sources.

Anapole-Mediated Emission Enhancement in Gallium Nitride Nanocavities