Irregular ferroelectric element devised for motion of plural domain-walls
AssigneeHitachi, Ltd.
InventorsAkio Kumada, Hiroshi Takano, Yoshizumi Eto, Masao Hibi
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Abstract
An element in which only a single domain-wall can move sidewise, having a crystal plate of an irregular ferroelectric which is cut in the Z-plane at opposite surfaces and is then cut or cleaved in the <110> direction at its periphery and transparent electrodes for the polarization reversal provided at the central portions of the opposite Z-planes. The element includes at least a domain configuration such that two nucleus regions of opposite polarities are disposed on opposite sides of the region, i.e., a domain having a stationary polarity, where the electrodes are provided.
Claims4
An optical slit unit which employs an irregular ferroelectric element comprising:
- a crystal Z-plate of irregular ferroelectric material having a pair of opposing surfaces bounded by the sides of the plate, at least a pair of which sides opposing one another being cut in the <110>
- direction;
- and
- means, coupled to said pair of opposing surfaces, for reversing the state of polarization of said plate;
- and wherein
- said plate has a domain configuration such that said plate includes a central nucleus-region of a prescribed polarity and two side nucleus-regions having a polarity opposite that of said central nucleus-region and being disposed on opposite sides of said central nucleus-region, with a respective domain growth wall interposed between said central nucleus-region and each of said side nucleus-regions.
Dependencies are inferred from the claim text.