Rostock 2019 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 57: Poster: Quantum Optics and Photonics III

Q 57.43: Poster

Donnerstag, 14. März 2019, 16:15–18:15, S Fobau Physik

Waveguide-integrated superconducting nanowire single-photon detectors made from amorphous molybdenum silicide — •Matthias Häußler1,2, Martin A. Wolff1,2, Wolfram Pernice1,2, and Carsten Schuck1,21University of Münster, Physics Institute, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany — 2CeNTech - Center for NanoTechnology, Heisenbergstr. 11, 48149 Münster, Germany

The growing interest in quantum optics experiments on silicon chips has created a need for efficient, low-noise yet scalable single photon detectors. Superconducting nanowire single-photon detectors (SNSPDs) fabricated directly on top of nanophotonic waveguides integrate seamlessly with established nanophotonic platforms and combine attractive performance with a small footprint in a scalable fashion.

Integrated SNSPDs from crystalline superconducting thin-films have been realized on a variety of waveguide materials, however the integration into large-scale circuits is limited by poor detector yield. Integrated SNSPDs from amorphous superconductors are believed to show similar performance and can be fabricated with high yield on a wider range of material platforms as lattice matching becomes irrelevant.

In this work we take advantage of the high substrate compatibility of amorphous superconducting molybdenum silicide thin films and realized waveguide-integrated SNSPDs in high-quality silicon nitride-on-insulator nanophotonic circuits. We present measurements on the performance of the devices that reveal intrinsic differences between SNSPDs made from amorphous and crystalline materials.

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