Freiburg 2024 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 37: Poster III
Q 37.49: Poster
Wednesday, March 13, 2024, 17:00–19:00, Tent B
High-performance imaging of nanophotonic structures in cryogenic envoirment — •Timo Eikelmann1, Donika Imeri1,2, Rikhav Shah1, Lasse Irrgang1, Mara Brinkmann1, Tuncay Ulas1, Konstantin Beck1, Lennart Manthey1, and Ralf Riedinger1,2 — 1Zentrum für Optische Quantentechnologien, Universität Hamburg, 22761 Hamburg — 2The Hamburg Centre for Ultrafast Imaging, 22761 Hamburg, Germany
Quantum networks require long coherence times, good interaction between atoms and photons, and strong interaction between qubits. Silicon vacancy centers within a nanophotonic diamond cavity are promising in this field. These nanophotonic structures are essential for light-matter interaction and efficient coupling to the silicon center. Structures are approximately 10 micrometers long and 500 nm wide and placed inside a cryostat to cool them down to around 0.1 Kelvin. Creating a high-performance imaging system inside a cryostat poses challenges. The imaging system must be placed partially inside the cryostat and partially outside and therefore is over 2 meters long. We implement an 8f imaging system and a pair of galvanometer-driven mirrors to scan a focused laser beam across the nanophotonic structure. This enables high-performance imaging, the scanning of a desired area with a laser in a short time and provides flexibility in imaging the given structures. High-resolution imaging enables precise coupling between nanophotonic structures and optical fibers, enabling research of efficient fiber-coupled quantum network nodes.
Keywords: Silicon vacancy center; Imaging; Nanophotonic structure; Colour center; Quantum communication