Strong coupling through optical positioning of a quantum dot in a photonic crystal cavity

crystal cavities have relied largely on random chance 5,6 and often required the measurement of many devices before finding a cavity in which a quantum dot is both spectrally and spatially in resonance with the cavity mode. These devices have the additional complication that the photonic crystal cavity typically interacts with many emitters due to the large quantum dot density required to find a strongly coupled device. A deterministic coupling method based on using atomic force microscopy to locate the strain sites of buried quantum dots has previously been demonstrated. 7,8 Here, we present an all-optical method for measuring the positions of individual quantum dots that allows us to deterministically achieve strong coupling between a quantum dot and a photonic crystal cavity. This versatile method can be performed in the measurement setup at a very low quantum dot density and could be applied to many emitter-cavity systems. Our technique relies on the precise determination of the optical