期刊
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL
卷 68, 期 8, 页码 2824-2831出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TUFFC.2021.3078447
关键词
Radiation effects; Switches; Crystals; Resists; Shape; Photonic crystals; Microscopy; Confocal Raman microscopy (CRM); Cerenkov-type second-harmonic generation microscopy (CSHGM); domain structure; ion beam irradiation; local switching; piezoresponse force microscopy (PFM); relaxor ferroelectrics; strontium barium niobate
资金
- Russian Science Foundation [19-72-00008]
- Russian Science Foundation [19-72-00008] Funding Source: Russian Science Foundation
The study focused on the formation of domain structures in thermally depolarized Ce-doped strontium barium niobate single crystals covered by a dielectric layer through ion beam irradiation. It was found that the size and depth of the domains depended on the irradiated dose, with isolated circular domains and a linear dose dependence of the switched area.
Formation of the domain structure by ion beam irradiation was studied in thermally depolarized Ce-doped strontium barium niobate single crystals covered by a dielectric layer. Three types of irradiation regimes were used: dot exposure, stripe exposure, and line exposure. The dependences of the domain size and depth on the irradiated dose were measured. The circular shape of the isolated domains with partially switched broad domain boundary was obtained. Isotropic domain growth was attributed to the step generation at the wall by merging with the residual nanodomains that appeared after thermal depolarization. The obtained linear dose dependence of the switched area was attributed to the screening of the depolarization field by the injected charge. The shape distortion of the domains growing in the neighborhood with already created ones was attributed to the electrostatic interaction of the approaching charged domain walls. The obtained results can be applied for the creation of precise domain patterns with arbitrary orientation and shape to produce nonlinear optical devices with improved characteristics, including electrically tunable diffractive optical elements.
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