Forward growth and formation of 1D domain arrays by focused ion beam in Y-cut MgOLN

Abstract

The ion beam-induced domain growth in Y-cut MgO-doped lithium niobate (MgOLN) covered by the resist layer was studied. A comparative study of domain structure in the samples with and without surface dielectric layer is crucial for periodical poling. Differences in the domain shape with changes in the irradiation dose, energy, and current of the ion beam were revealed. The maximum domain depth was 400 nm at 100 pC. A detailed analysis of interaction for different distance between irradiated dots in row revealed formation of 1 D arrays with variating length of the wedge-like domains. These findings allow optimizing the poling process.

Keywords:

• Non-polar cut
• lithium niobate
• ferroelectric domain
• ion beam patterning
• dielectric layer

Acknowledgments

The equipment of the Ural Center for Shared Use “Modern nanotechnology” Ural Federal University (reg. no. 2968), which is supported by the Ministry of Science and Higher Education RF (project no. 075-15-2021-677) was used.

Additional information

Funding

The research was made possible by Russian Science Foundation (project no. 19-12-00210), https://rscf.ru/project/19-12-00210/.