Regensburg 2025 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 57: Quantum Dots and Wires: Optics II

HL 57.2: Talk

Friday, March 21, 2025, 09:45–10:00, H13

Scalable integration of site-controlled quantum dots into circular Bragg grating resonators — •Kartik Gaur, Avijit Barua, Sarthak Tripathi, Sam Baraz, Lukas Dworaczek, Neha Nitin, Imad Limame, Aris Koulas-Simos, Priyabrata Mudi, Sven Rodt, and Stephan Reitzenstein — Institut für Festkörperphysik, Technische Universität Berlin, D-10623 Berlin

The buried-stressor approach [1] is one of the pivotal methods for the growth of site-controlled quantum dots (SCQDs). This growth technique makes use of the strain from a partially oxidized AlAs layer to induce site-selective nucleation of InGaAs quantum dots. Here, we report on growth, fabrication, and surface and optical characterizations of such SCQDs. A systematic investigation of the effects of variation of SCQD growth parameters on QDs density, surface morphology, and optical properties is done using atomic force microscopy (AFM), cathodoluminescence (CL), and microphotoluminescence (µPL) spectroscopy. Moreover, these SCQDs are integrated into circular Bragg gratings (CBGs) in a scalable manner highlighting the advantage of our advanced growth approach. Quantum optical characterizations are also performed on these SCQD-CBGs. The comprehensive understanding of the intricacies involved in the growth and characterization of SCQDs and their scalability in device integration offers a roadmap for the advancement of nanophotonic technologies and quantum information.

[1] A. Strittmatter, et. al., Applied Physics Letters, 100(9):093111, 03 2012.

Keywords: Site-controlled; Circular Bragg grating