SKM 2023 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 49: Quantum dots: Devices

HL 49.6: Talk

Friday, March 31, 2023, 11:15–11:30, POT 151

Deterministically fabricated InAs quantum dot based single-photon sources at telecom wavelengths — •Monica Pengerla¹, Alkaales Mohanad², Ranbir Kaur², Jan Donges¹, Lucas Bremer¹, Johannes Schall¹, Sven Rodt¹, Mohamed Benyoucef², and Stephan Reitzenstein¹ — ¹Institut für Festkörperphysik, Technische Universität Berlin, Hardenbergstraße 36, D-10623 Berlin, Germany — ²Institute of Nanostructure Technologies and Analytics (INA), Center for Interdisciplinary Nanostructure Science and Technology (CINSaT), University of Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany

Quantum dot (QD) based single-photon sources are key elements of photonic quantum networks. Most interesting are sources emitting at telecom wavelengths to enable long distance fiber-based quantum communication. Here, we report on deterministically fabricated single-photon sources based on InAs QDs grown on InP substrate. Numerical simulations of such QD heterostructures with backside distributed Bragg reflector reveal photon extraction efficiency exceeding 50% when QDs are integrated into mesa or circular Bragg grating structures. A state-of-the-art electron beam lithography (EBL) system with integrated low temperature cathode luminescence (CL) system allows us to perform in-situ EBL at telecom wavelengths. For noisy CL maps, an advanced approach for machine learning enhanced in-situ EBL to enhance the maps at telecom wavelengths for better integration of QDs into photonic structures is used. Micro-photoluminescence studies reveal the optical properties of the fabricated quantum devices.