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Efficient collection of fluorescence from nitrogen vacancy (NV) centers indiamond underlies the spin-dependent optical read-out that is necessary forquantum information processing and enhanced sensing applications. The opticalcollection efficiency from NVs within diamond substrates is limited primarilydue to the high refractive index of diamond and the non-directional dipoleemission. Here we introduce a light collection strategy based on chirped,circular dielectric gratings that can be fabricated on a bulk diamond substrateto redirect an emitter's far-field radiation pattern. Using a geneticoptimization algorithm, these grating designs achieve 98.9% collectionefficiency for the NV zero-phonon emission line, collected from the backsurface of the diamond with an objective of aperture 0.9. Across the broadbandemission spectrum of the NV (600-800 nm), the chirped grating achieves 82.2%collection efficiency into a numerical aperture of 1.42, corresponding to anoil immersion objective again on the back side of the diamond. Our proposedbulk-dielectric grating structures are applicable to other optically activesolid state quantum emitters in high index host materials.

Near-unity collection efficiency from quantum emitters in bulk diamond using chirped circular dielectric gratings