Patent ID: 6762874
Filing Date: 2004-07-13
Classification: G02F

Abstract:
A polarization inversion method for ferroelectrics, comprising the steps of:forming a plurality of electrodes on a first surface of a ferroelectric crystal that has been subjected to a single polarization, the electrodes having a predetermined pattern; forming a local polarization inversion portion in said ferroelectric crystal by applying an electric field to front and back surfaces of said ferroelectric crystal; wherein first portions of said ferroelectric crystal, each corresponding to a corresponding one of the electrodes and second portions between the first portions are subjected to a polarization inversion, and one polarization inversion portion having a desired pattern is formed; and wherein one polarization inversion portion is formed for each group of electrodes by use of periodic electrodes in which a plurality of electrode groups composed of the electrodes are periodically formed as said electrodes, thus forming a periodic polarization inversion structure in which the polarization inversion portion is periodically formed.