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Polariton lasers are mostly based on planar cavities. Here we focus on an alternative configuration with slab waveguide modes strongly coupled to excitons confined in GaN/AlGaN quantum wells. We study experimentally and theoretically polariton relaxation at temperatures ranging from 4 to 200 K. We observe a good robustness of the lower polariton population peak energy position against temperature changes due to a balance between the shift of the exciton energy and the change in the normal mode splitting, a promising feature for future applications such as lasers and amplifiers where a small temperature drift in the emission wavelength is a desired asset. Finally, at T = 4 K we observe the signature of polariton nonlinearities occurring in the continuous wave regime that are assigned to an optical parametric oscillation process.
Romain Christophe Rémy Fleury, Bakhtiyar Orazbayev, Nadège Sihame Kaïna
Romain Christophe Rémy Fleury, Bakhtiyar Orazbayev
Romain Christophe Rémy Fleury, Bakhtiyar Orazbayev, Nadège Sihame Kaïna