  Coupling nitrogen-vacancy centers in diamond to optical cavities is a
promising way to enhance the efficiency of diamond based quantum networks. An
essential aspect of the full toolbox required for the operation of these
networks is the ability to achieve microwave control of the electron spin
associated with this defect within the cavity framework. Here, we report on the
fabrication of an integrated platform for microwave control of an NV center
electron spin in an open, tunable Fabry-Perot microcavity. A critical aspect of
the measurements of the cavity's finesse reveals that the presented fabrication
process does not compromise its optical properties. We provide a method to
incorporate a thin diamond slab into the cavity architecture and demonstrate
control of the NV center spin. These results show the promise of this design
for future cavity-enhanced NV center spin-photon entanglement experiments.
