Patent ID: 9599876
Date: 2017-03-21
CPC Classifications: G02F

Claim:
1. A cyclic polarization reversal structure forming method comprising: forming a plurality of stripe electrode sections with a stripe shape extending in parallel at a gap from each other, on the +Z surface of a ferroelectric crystal substrate in contact with said ferroelectric crystal substrate; forming an insulation film over said +Z surface so as to cover said plurality of stripe electrode sections; forming an equipotential electrode section, which has a portion that only partially opposes each of said plurality of stripe electrode sections across said insulation film, over said insulation film without contacting said ferroelectric crystal substrate or said plurality of stripe electrode sections; forming a planar electrode, on the −Z surface of said ferroelectric crystal substrate that opposes said +Z surface, so as to cover the entire area that opposes said +Z surface area on which said plurality of stripe electrode sections are formed; and applying a voltage between said equipotential electrode section and said planar electrode to generate an electric field between said plurality of stripe electrode sections and said planar electrode and create a polarization reversal structure on said ferroelectric crystal substrate directly below said plurality of stripe electrode sections.