Berlin 2024 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 19: Quantum Dots and Wires: Optics I
HL 19.8: Talk
Tuesday, March 19, 2024, 11:45–12:00, EW 202
Development and deterministic fabrication of electrically controlled quantum dot bullseye resonators — •Setthanat Wijitpatima1, Priyabrata Mudi1, Avijit Barua1, Normen Auler2, Binamra Shrestha2, Sven Rodt1, Dirk Reuter2, and Stephan Reitzenstein1 — 1Institute of Solid-State Physics, Technische Universität Berlin, D-10623 Berlin, Germany — 2Center of Optoelectronics and Photonics, Paderborn University, Warburger Str. 100, 33098 Paderborn, Germany
Quantum repeaters hold the potential to contribute to long-distance quantum communication significantly. They can be made of such quantum light sources with high photon extraction efficiency (PEE), high single-photon purity, high indistinguishability, and precise control over spectral features. We present a new device design enabling the electrical control of quantum dots (QDs) by deterministically integrating them into electrically connected bullseye resonators. Numerical simulations are conducted to optimize both the epitaxial layer structure and the nanophotonic device design achieving a high PEE of 74% at a numerical aperture of 0.8. Marker-based cathodoluminescence scans are performed to pre-select suitable QDs, which are then pre-characterized via electric-field-dependent micro-photoluminescence measurements before electron beam lithography is performed to fabricate QD-bullseye resonators. After the integration, the post-characterizations are carried out on the same QDs to study the effect of device fabrication on their electro-optical properties.
Keywords: InAs Quantum Dot; Electric-Dependent Photoluminescence; Circular Bragg Grating; Electron Beam Lithography; Cathodoluminescence