  We demonstrate non-perturbative coupling between a single self-assembled
InGaAs quantum dot and an external fiber-mirror based microcavity. Our results
extend the previous realizations of tunable microcavities while ensuring
spatial and spectral overlap between the cavity-mode and the emitter by
simultaneously allowing for deterministic charge control of the quantum dots.
Using resonant spectroscopy, we show that the coupled quantum dot cavity system
is at the onset of strong coupling, with a cooperativity parameter of 2. Our
results constitute a milestone towards the realization of a high efficiency
solid-state spin-photon interface.
