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Quantum light sources based on deterministic microlenses structures with (111) In(Ga)As and AlInAs QDs.

Derebezov, I. A.; Haisler, V. A.; Haisler, A. V.; Dmitriev, D. V.; Toropov, A. I.; Rodt, Sven; Helversen, Martin von; Haye, Christoph de la; Bounouar, Samir; Reitzenstein, Stephan

AG Optoelektronik und Quantenbauelemente

The results of the development and implementation of a single photon source based on a bottom semiconductor Bragg reflector, top deterministic GaAs microlens structures and a single (111) In(Ga)As QD are presented. The structure of the microcavity ensures effective pumping of a single (111) In(Ga)As QD and high emission output efficiency, a clear single – photon emission was detected with a second – order correlation function at zero delay g(2)(0) = 0.07. A system of QD’s on the basis of AlXIn1-XAs/AlYGa1-YAs solid solutions has been studied. The usage of broadband AlXIn1-XAs solid solutions as the basis of quantum dots makes it possible to expand considerably the spectral emission range into the short-wave region, including the wavelength region near 770 nm being of interest for the design of aerospace systems of quantum cryptography. The optical characteristics of single AlXIn1-XAs quantum dots grown according to the Stranski–Krastanov mechanism are studied by the cryogenic microphotoluminescence method.