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THU: Thursday Contributed Sessions

THU 13: Poster Session: Applications

THU 13.34: Poster

Thursday, September 11, 2025, 16:30–18:30, ZHG Foyer 1. OG

Toward Strong Coupling of Rare-Earth Ions in High-Q Photonic Crystal Cavities on a Hybrid LNOI-TiO₂ Platform — •Tobias Feuerbach, Georgii Grechko, Christopher Ng, Roman Kolesov, and Jörg Wrachtrup — University of Stuttgart, 3rd Institute of Physics, Pfaffenwaldring 57, 70569 Stuttgart

We report progress toward integrating rare-earth ions (REIs) into high-Q photonic crystal cavities (PCCs) for achieving strong light-matter coupling. Our approach leverages a hybrid material system combining lithium niobate on insulator (LNOI), offering electro-optical tunability, with TiO₂, a spin-free host for REIs. High-Q PCCs in LNOI have been achieved, and development is underway to incorporate REI-doped TiO₂ films into the platform. This hybrid architecture offers a promising path toward scalable, tunable quantum interfaces. Recent milestones in fabrication and characterization will be presented.