Semiconductor quantum dot to fiber coupling system for 1.3 um 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

doi:10.1117/12.2306179

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, 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, and Michał Dłubek "Semiconductor quantum dot to fiber coupling system for 1.3μm range", Proc. SPIE 10674, Quantum Technologies 2018, 106741R (21 May 2018); https://doi.org/10.1117/12.2306179

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KEYWORDS

Microlens

Luminescence

Quantum wells

Fiber couplers

Semiconductors

Interferometry

Quantum dots

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