Coupling a single or several quantum dots with a nanoscale optical cavity allows for the realization of novel light devices such as single and entangled photon sources, or nanolasers with a very low threshold, even threshold-less lasers. The basic mechanism behind all these realizations is the engineering of the spontaneous emission of the dipoles using the Purcell effect.
The presentation will be two fold.
On one hand we will present the realization of an efficient source of polarization entangled photons taking advantage of the Purcell effect to restore entanglement, as well as new designs of cavities showing broadband (>50nm) Purcell.
On the other hand, we will present the work towards the realization of threshold-less lasers, presenting new tools to define the stimulated emission threshold, but also the high-order coherence (g(n)(0), n=2,3,4) of gain-switched nanolasers, showing chaotic statistics even above lasing threshold.
Both applications require the development of new quantum dots at the telecommunication wavelength, and we will review the latest developments of our laboratory on MOCVD InAsP/InP quantum dots.