Regensburg 2025 – scientific programme

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 18: Materials Research in Polar Oxides: Perspectives for Optics & Electronics

KFM 18.1: Invited Talk

Thursday, March 20, 2025, 15:30–16:00, H9

Domain gratings of sub-micrometer period for quantum technologies — •Carlota Canalias — KTH-Royal Institute of Technology, Stockholm Sweden

This talk explores the challenges and advancements in developing sub-micron ferroelectric domain gratings, which are vital for nonlinear optical devices capable of generating counter-propagating photons. Conventional materials and poling methods have proven insufficient to support these cutting-edge optical interactions, thereby constraining their applications in both classical and quantum technologies. The presentation showcases a breakthrough in periodic poling techniques for KTP isomorphs, enabling the fabrication of bulk structures with domain sizes as small as 200 nm. This achievement leverages coercive-field gratings formed via ion exchange, which play a pivotal role in domain formation. Our results demonstrate that the creation of sub-micron domains is governed by the characteristics of the ion-exchanged region, rather than the poling period, opening new possibilities for designing smaller and more intricate domain-engineered devices.

Keywords: KTP; periodic poling; nonlinear optics