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Brightsingle photon sources have recently been obtained by insertingsolid-state emitters in microcavities. Accelerating the spontaneousemission via the Purcell effect allows both high brightness and increasedoperation frequency. However, achieving Purcell enhancement is technologicallydemanding because the emitter resonance must match the cavity resonance.Here, we show that this spectral matching requirement is stronglylifted by the phononic environment of the emitter. We study a singleInGaAs quantum dot coupled to a micropillar cavity. The phonon assistedemission, which hardly represents a few percent of the dot emissionat a given frequency in the absence of cavity, can become the mainemission channel by use of the Purcell effect. A phonon-tuned singlephoton source with a brightness greater than 50% is demonstrated overa detuning range covering 10 cavity line widths (0.8 nm). The sameconcepts applied to defects in diamonds pave the way toward ultrabrightsingle photon sources operating at room temperature. [ABSTRACT FROM AUTHOR]

We experimentally demonstrate the controlled enhancement of the mechanical quality factor Q of gallium arsenide disk optomechanical resonators. Disks vibrating at 1.3 GHz with a mechanical shield integrated in their pedestal show a Q improvement by a factor 10–16. The structure is modeled numerically and different modes of vibration are observed, which shed light on the Q enhancement mechanism. An optimized double-disk geometry is presented that promises Q above the million for a large parameter range. [ABSTRACT FROM AUTHOR]