M. Zamfirescu

TL;DR: In this paper, the authors report the direct optical measurement of the exciton oscillator strength f in ZnO and propose a model of the microcavity structure for the observation of the polariton laser effect.

TL;DR: This work reports the first observation of oscillations of the electromagnetic field in an optical superlattice based on porous silicon, an optical equivalent of well-known electronic Bloch oscillations in crystals.

TL;DR: In this article, the static and dynamic responses of excitons in state-of-the-art bulk and epitaxial ZnO epilayers are reviewed to support the possible realization of polariton lasers, which are coherent and monochromatic light sources due to Bose condensation of exciton-polaritons.

TL;DR: In this paper, the authors present time-resolved photoluminescence measurements of quantum dots showing a relevant interplay between recombination kinetics and thermalization processes, and experimentally demonstrate that the thermal population of optically inactive states fully accounts for the increase of the intrinsic radiative lifetime in quantum dots when the lattice temperature raises.

TL;DR: In this paper, the authors demonstrate strong light-matter coupling at room temperature in a GaN microcavity using simultaneous reflectivity and photoluminescence measurements, despite the well-known dominance of GaN emission at low temperature by localized neutral donor bound excitons.