Bonn 2025 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 48: Poster – Quantum Optics, Technologies, and Optomechanics
Q 48.10: Poster
Mittwoch, 12. März 2025, 17:00–19:00, Tent
3D printed microstructures for scalable coupling of SNSPDS on wafers — •Stefan Vorwerk1, Johanna Biendl1,2, Frederik Thiele1,2, and Tim Bartley1,2 — 1Department of Physics, Paderborn University — 2Institute for Photonic Quantum Systems
Due to their outstanding properties, such as a broad spectrum, low dark count rates, and high efficiency, SNSPDs have become the leading technology for single-photon detection. For achieving near unity detection efficiency with SNSPDs, low-loss coupling from the fiber to the detector must be ensured. For single-pixel devices, this is readily achieved using self-aligning zirconia sleeves. Nevertheless, this requires a deep-etch into the substrate, which may be detrimental or impossible in some substrates, and limits the packing density of detectors. We are exploring alignment techniques on arbitrarty substrates and wafers. To enhance coupling efficiency, we fabricate 3D printed nanostructures using 2-photon polymerization to align the fiber with the detector and provide mechanical stability. It is also possible to integrate additional optics, such as lenses or tapers, into the 3D printed structure. For an optimized fabrication process and the characterization of the printed structures, we investigate the optical properties and the mechanical stability of the polymer at cryogenic temperatures and test different coupler designs.
Keywords: Single photon detectors; Micro- and nanofabrication; Photonic interconnects