BRIMONT , C.

Les fluides quantiques d'excitons indirects sont un système bosonique intéressant en tant qu'état collectif quantique de longue durée de vie. Nous présentons les progrès récents pour leur génération, leur refroidissement et leur piégeage dans des puits quantiques GaN/(Al,Ga)N, ainsi que les premières indications de condensation dans un état...

Excitons hosted by GaN/(Al,Ga)N quantum wells (QWs) are spatially indirect due to the giant built-in electricfield that separates electrons and holes along the growth direction. This electric field, and thus exciton energy,can be reduced by depositing metallic layers on the sample surface. Using spatially resolved microphotolu-minescence...

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We experimentally demonstrate polariton laser in a GaN ridge waveguide. The strong-coupling regime is assessed through a comparison of the measured and modeled cavity free spectral range (FSR). The findings reveal that the laser exhibits a transition from monomode to multimode operation as the temperature is increased from 70K to 150K. The...

Le laser à polaritons en géométrie de guide d'onde intéresse de par ses propriétés uniques résultant du couplage fort exciton-photon. Cette étude se concentre sur une cavité GaN courte de 60 µm, où le fonctionnement en continu ou en régime de blocage de mode est observé. La dépendance de ces régimes est étroitement liée au spectre de gain, à la...

Le laser à polaritons en géométrie de guide d'onde intègre une couche active en régime de couplage fort exciton-photon. Dans une cavité GaN horizontale courte (60µm), nous démontrons un fonctionnement en continu ou en régime de blocage de modes contrôlable, dépendant du spectre de gain, de la dispersion de vitesse de groupe et de la...

We demonstrate phase-matched second harmonic generation in gallium nitride on silicon microdisks. The microdisks are integrated with side-coupling bus waveguides in a two-dimensional photonic circuit. The second harmonic generation is excited with a continuous wave laser in the telecom band. By fabricating a series of microdisks with diameters...

Polaritons in waveguides offer novel potentialities for their application in optoelectronics, based on the concept of the polariton laser. Unlike a conventional semiconductor laser, polariton laser does not require any population inversion in order to stimulate the light emission, which potentially allows the creation of laser components...

Polariton lasers rely on the stimulated relaxation of polaritons instead of the population inversion involved in conventional semiconductor lasers. Exciton-polaritons are hybrid quasi-particles arising from the strong coupling between excitons and photons. Polariton lasers have first been investigated in vertical microcavities, and more...

Polaritonic waveguides are bringing new potentialities to the field of polaritonics. The low waveguide losses allow for long propagation distances, up to hundreds of microns. In GaAs waveguides at T=4K, the formation of bright temporal solitons was demonstrated [1], as well as the generation of a super-continuum. Wide bandgap materials offer...