and the field re-radiated by the emitter in the cavity[@vuckovic2007; @garnier2007; @rakher2009; @bonato2010]. When performing measurements with a quantum dot ensemble, rather than a single quantum dot, coupled to the cavity mode, it is difficult to extract the coupling efficiency directly from the signal intensity. Instead, the improved coupling efficiency was experimentally demonstrated using resonant reflection spectroscopy. A tunable laser was scanned across the cavity resonance, and the reflected light was collected by the same microscope objective and passed through a polarizer before arriving at the detector. The polarizer was adjusted to select one of the two linearly-polarized modes. In the case of perfect mode-matching, one would expect a dip in the reflection spectrum corresponding to the cavity resonance. In the case of quantum information schemes based on dipole-induced reflection, the bare cavity reflectivity on resonance should be ideally zero, so that the whole reflected signal can be given by the emitter coupled to the cavity. Our experimental results are shown in Fig. \[figfano\]. For the un-optimized cavities we could not get a detectable dip above the noise level, while for far-field optimized cavities we could get a high-contrast reflection dip, with contrast up to 60$\%$. The contrast of the 