Berlin 2018 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 50: HL Poster IV
HL 50.12: Poster
Donnerstag, 15. März 2018, 19:00–21:00, Poster B
Accurate Optical Alignment of Self-assembled Quantum Dots with Gate-defined Quantum Dots — •Eva Gross1, Arne Ludwig2, Zheng Zeng1, Detlev Grützmacher1, and Beata Kardynal1,3 — 1Peter Grünberg Institute (PGI-9), Forschungszentrum Jülich, Germany — 2Lehrstuhl für Angewandte Festkörperphysik, Ruhr-Universität Bochum, D-44780 Bochum, Germany — 3JARA - Fundamentals of Future Information Technology, RWTH Aachen University, Germany
InAs self-assembled quantum dots (SAQDs) are widely used in various quantum devices for quantum information processing with photons. In many of these applications an alignment of the SAQDs with other elements of the device is crucial to the device operation. Here we explore optical methods to locate SAQDs which can be used as pre-processing steps in device fabrication. The method should be compatible with processing of hybrid devices in which SAQDs and gate defined quantum dots in GaAs/AlGaAs are tunnel coupled. In this presentation we will compare two different photoluminescence based approaches. In both cases, alignment features are used to determine the position of the QDs. In the first method, the imaging process is realized directly by an EMCCD camera. SAQDs and alignment markers are selectively illuminated with light sources of different wavelengths. In the second approach, photoluminescence spectra at different positions of the sample are recorded while a focused spot of laser light is scanned across it.