Understanding the optical properties of quantum emitters is the cornerstone of many phenomena in nanophotonics. Spontaneous emission from quantum emitters can be modified when they are placed in resonators, for example, near plasmonic or dielectric nanoantennas. We numerically study the Purcell factor of the emitter inside a nanodiamond placed near the resonant silicon nanoparticle. We show that in this system the 11-fold enhancement can be achieved for a specific orientation of the dipole moment of the emitter. The obtained results are of particular importance for nanophotonic applications which aim to control optical properties of quantum light sources.

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