The widespread application of quantum devices requires efficient and reproducible photonic structures over large areas. In this article, we report a method that allows the polarization of lithium niobate films to be controlled uniformly and reliably across the entire surface of a wafer. This so-called periodic poling is important for controlling light in quantum devices, for example, to enable tailored and highly efficient components. This technique supports improved scalability for the production of complex photonic chips based on lithium niobate. The research was funded by the German Research Foundation (DFG).
Bollmers, L., Spiegelberg, N., Rüsing, M., Eigner, C., Padberg, L. & Silberhorn, C. Segmented finger electrodes to optimize ultra-long continuous wafer-scale periodic poling in thin-film lithium niobate. Nanophotonics, 14, 4761-4771 (2025). https://doi.org/10.1515/nanoph-2025-0461
