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21 May 2018 Semiconductor quantum dot to fiber coupling system for 1.3μm range
Kinga Żołnacz; Wacław Urbańczyk ; Nicole Srocka; Tobias Heuser; David Quandt; André Strittmatter; Sven Rodt; Stephan Reitzenstein; Anna Musiał; Paweł Mrowiński; Grzegorz Sęk; Krzysztof Poturaj; Grzegorz Wójcik; Paweł Mergo; Kamil Dybka; Mariusz Dyrkacz; Michał Dłubek
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Proceedings Volume 10674, Quantum Technologies 2018; 106741R (2018) https://doi.org/10.1117/12.2306179
Event: SPIE Photonics Europe, 2018, Strasbourg, France
Abstract
We present an alignment procedure which allows for precise gluing of a structure with an optically pumped quantum emitter to the end face of zirconia ferrule with a specially fabricated high numerical aperture single-mode fiber. The proposed method is an important step towards building a single-photon source based on an InGaAs quantum dot emitting in 1.3 μm range and located deterministically in a microlens fabricated by in-situ electron beam lithography and plasma etching to improve the photon extraction efficiency. Since single QDs are very dim at room temperature which hinders QD-fiber adjustment by maximizing the collected photoluminescence signal, the developed method uses light back-reflected from the top surface of the sample with microlens as a feedback signal. Using this approach, we were able to position the high-NA fiber over the center of the microlens with an accuracy of about 150 nm in a lateral direction and 50 nm in a vertical direction. The alignment accuracy was confirmed by following the room temperature emission from quantum wells embedded in a reference microlens. We also present initial low temperature tests of the coupling system mounted in a compact and portable Stirling cryocooler.
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Kinga Żołnacz, Kinga Żołnacz, Wacław Urbańczyk , Wacław Urbańczyk , Nicole Srocka, Nicole Srocka, Tobias Heuser, Tobias Heuser, David Quandt, David Quandt, André Strittmatter, André Strittmatter, Sven Rodt, Sven Rodt, Stephan Reitzenstein, Stephan Reitzenstein, Anna Musiał, Anna Musiał, Paweł Mrowiński, Paweł Mrowiński, Grzegorz Sęk, Grzegorz Sęk, Krzysztof Poturaj, Krzysztof Poturaj, Grzegorz Wójcik, Grzegorz Wójcik, Paweł Mergo, Paweł Mergo, Kamil Dybka, Kamil Dybka, Mariusz Dyrkacz, Mariusz Dyrkacz, Michał Dłubek, Michał Dłubek, } "Semiconductor quantum dot to fiber coupling system for 1.3μm range", Proc. SPIE 10674, Quantum Technologies 2018, 106741R (21 May 2018); doi: 10.1117/12.2306179; https://doi.org/10.1117/12.2306179
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