Dependence of long term stability on the initial radius of small inverted domains formed on congruent single-crystal LiTaO3

The dependence of the initial radius on the long term stability of small inverted domain dots was investigated by heat treatment of an 80-nm-thick congruent LiTaO3 plate with inverted domain dots with radii of 20-200 nm at 250°C for 20 h. A linear relationship between the dot area after heat treatment and the initial dot area was determined, and the initial radius dependency on the long term stability of small inverted domains was formulated.