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DS: Fachverband Dünne Schichten

DS 28: Poster: Thin Film Properties: Structure, Morphology and Composition

DS 28.1: Poster

Mittwoch, 18. März 2020, 15:00–18:00, P1A

Long-time stability of swift-heavy ion irradiated LiNbO₃ — •Veronica Lopez Marcos¹, Elke Wendler¹, Liang-Ling Wang^1,2, Alma Dauletbekova³, Maxim Zdorovets³, and Carsten Ronning¹ — ¹Institut für Festkörperphysik, Friedrich-Schiller-Universität Jena, Germany — ²School of Physics and Technology, University of Jinan, P. R. China — ³L. N. Gumilyov Eurasian National University, Nur-Sultan, Kazakhstan

Lithium niobate (LiNbO₃) has been a material of interest in optics for many years. For the production of photonic devices, ion-beam induced amorphisation can be applied, which is connected with a reduced refractive index. In order to satisfy optical application requirements, thick layers of amorphous material may be needed, which can be achieved by implantation of swift heavy ions. However, the long-term stability of the amorphous structure must be guaranteed, which is investigated in this presentation. LiNbO₃ samples were irradiated with 66 MeV Xe-ions at ion fluences from 5 × 10¹⁰ to 3 × 10¹³ cm⁻². Later the samples were analyzed with Rutherford backscattering spectrometry in channeling mode using 1.4 MeV He-ions. It was found that the fluence-dependent increase of damage is well represented by the direct impact model. The obtained radius of the amorphous tracks produced by individual ions is in agreement with previous results which were measured right after ion irradiation. This indicates that no annealing of amorphous tracks in a crystalline surrounding occurred. In order to understand the damage structure obtained when the tracks overlap forming a complete amorphous layer, further studies are in progress.