Berlin 2024 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 14: Poster II

HL 14.16: Poster

Montag, 18. März 2024, 15:00–18:00, Poster F

Towards Low Temperature Imaging of Telecom Wavelength InGaAs Quantum Dots — •Lukas Wagner, Stephanie Bauer, Ponraj Vijayan, Michael Jetter, Simone Luca Portalupi, and Peter Michler — Institut für Halbleiteroptik und Funktionelle Grenzflächen (IHFG), Center for Integrated Quantum Science and Technology (IQST) and SCoPE, University of Stuttgart, Allmandring 3, 70569 Stuttgart, Germany

Semiconductor quantum dots are a promising non-classical light source for quantum information technology. To boost the fabrication yield of bright single and entangled photon pair sources, deterministic fabrication techniques can be employed. For this purpose, three techniques have been developed: low temperature deterministic optical lithography, low temperature deterministic electron beam lithography, and low temperature imaging, with recent interesting results also at telecommunication wavelengths. Markers from electron-beam lithography are used as reference points for determining the position of viable quantum dots for deterministic fabrication of spatially and spectrally matching micro cavities. Using standard micro photoluminescence techniques at telecom wavelengths for preselection and precise position determination is effective, but there is room for improvement in the upscaling of the process. To tackle this challenge an imaging setup is employed to speed up and enhance the precision of determining the position. In this contribution, a precise comparison between low temperature lithography and low temperature imaging at telecommunication wavelength will be discussed.

Keywords: Quantum Dots; Telecom C-band; Deterministic Fabrication