Bonn 2025 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 48: Poster – Quantum Optics, Technologies, and Optomechanics
Q 48.33: Poster
Mittwoch, 12. März 2025, 17:00–19:00, Tent
Realization of adaptive poling in thin-film lithium niobate waveguides — •Tobias Babai-Hemati, Laura Bollmers, Michael Rüsing, Laura Padberg, and Christine Silberhorn — University of Paderborn, Integrated Quantum Optics, Institute for Photonic Quantum Systems (PhoQS), Warburger Str. 100, 33098 Paderborn
Quantum technologies rely on internal quantum networks. As a result, all components- such as storage, fiber, and sensors- require frequency converters to handle the differences in frequencies.
In this work, the chosen platform is thin-film lithium niobate (TFLN). It has large nonlinear properties and a high effective refractive index contrast with SiO2. In TFLN, we realize frequency conversion with quasi-phase matching which is the periodic inversion of the crystal structure using an electric field. However, phase matching in TFLN waveguides is highly sensitive to variations in thin-film thickness of lithium niobate. We present a realization of adaptive poling (locally adapted periods) in TFLN to compensate for this effect. First, we measured the thin-film thickness profiles of a MgO-doped TFLN sample. Then, we simulated the corresponding poling periods, fabricated the devices, and poled with an electric field.
The poling results show that slight changes in the poling period do not significantly affect the homogeneity of the poled area with a single voltage pulse. In conclusion, this could allow for more efficient on-chip frequency conversions.
Keywords: Thin-film lithium niobate; Quasi-phase matching; Adaptive Poling; Domain Inversion