We demonstrate an approach, based on plasmonic apertures and gratings, toenhance the radiative decay rate of single NV centers in diamond, whilesimultaneously improving their collection efficiency. Our structures are basedon metallic resonators formed by surrounding sub-wavelength diamond nanopostswith a silver film, which can enhance the spontaneous emission rate of anembedded NV center. However, the collection efficiency of emitted photonsremains low due to losses to surface plasmons and reflections at thediamond-air interface. In this work, we mitigate photon losses into thesechannels by incorporating grating structures into the plasmonic cavity system.
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