Hannover 2020 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 13: Posters: Quantum Optics and Photonics I
Q 13.31: Poster
Monday, March 9, 2020, 16:30–18:30, Empore Lichthof
Waveguide integrated superconducting nanowire single-photon detectors made from NbTiN thin films — •Martin A. Wolff1,2,3,4, Simon Vogel1,2,3, Matthias Häußler1,2,3, Lukas Splitthoff1,2,3, and Carsten Schuck1,2,3 — 1Physics Institute, University of Münster, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany — 2CeNTech - Center for NanoTechnology, Heisenbergstr. 11, 48149 Münster, Germany — 3SoN - Center for Soft Nanoscience, Busso-Peus-Str. 10, 48149 Münster, Germany — 4martin.wolff@wwu.de
Superconducting nanowire single-photon detectors (SNSPDs) are an ideal match for integrated quantum photonic circuits because efficient interfaces between waveguide and detector are straightforwardly achieved. Employing a traveling wave geometry allows for simultaneously realizing high detection efficiency, low noise and accurate timing in high-speed operation [1]. Here we show that these performance characteristics are achievable across several photonic integrated circuit platforms using a universal fabrication process. We fabricate SNSPDs on Si3N4, Ta2O5 and LiNbO3 using a room-temperature magnetron sputtering process for niobium titanium nitride (NbTiN) thin films and state-of-art nanofabrication methods. Our process yields detectors with > 80% efficiency, MHz count rates, < 30 ps jitter and milli-Hz dark count rates at the telecommunication wavelength of 1550 nm. Our work opens up the possibility for retrofitting nanophotonic chips with single-photon detectors across a wide range of dielectric material systems. [1] S. Ferrari et al., Nanophotonics, 7, 1725 (2018)