Résumé:

Wide bandgap semiconductors (GaN and nitride alloys, ZnO) provide a spectrally-broad transparency -expanding from the near-infrared to the ultraviolet- as well as robust excitons that are efficiently interacting with light and stable up to room temperature. They offer a promising playground for non-linear optics and micro- or nano-lasers at 300K. Over the last decade, the progresses of the nitrides' processing has allowed to fabricate nanophotonic resonators and devices such that the interaction between excitons and photons can be tailored on demand. We will review our recent achievements, ranging from ZnO polariton lasers based on 2D vertical cavities, to UV-C GaN/AlN microdisk lasers and second-harmonic generation in photonic crystal cavities. These works result from collaborations with CNRS (CRHEA, LPN), and Orsay and Clermont-Ferrand Universities (IEF, IP).