Quantum Optics Seminar by Haitham El-Ella – Niels Bohr Institute - University of Copenhagen

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Quantum Optics Seminar by Haitham El-Ella

Cavity-coupled InGaN quantum dot systems promise to bring unique optical and electronic advantages as UV - blue single photon sources in terms of their large exciton binding energies, strong internal fields and the possibility of implementing them at temperatures not requiring liquid He. However, there has been little demonstration of cavity-coupled single photon sources using InGaN quantum dots, or any other III-nitride quantum dot for that matter, mainly due to growth and fabrication difficulties.

In this talk, growth, fabrication and tuning attempts of InGaN dot-cavity systems and the influence of their resulting microstructure on the efficacy of GaN microdisks and micropillars is discussed while outlining current progress. This includes process optimisation leading to lasing in both microdisk and micropillar cavities, quality factors approaching 10,000 in microdisks, and the tuning of microdisk cavity modes across a full spectra range without any noticeable degradation to its quality factor through photo-induced wet etching.