Ferroelectric crystal having inverted domain structure

Details Ferroelectric crystal having inverted domain structure Ferroelectric crystal having inverted domain structure

1996-07-24

1998-05-05

McGraw, Vincent P.

Optical: systems and elements

Optical frequency converter

Dielectric optical waveguide type

385122, 359328, G02F 137

Patent

active

057483612

ABSTRACT:
A method of forming ferroelectric domain regions in a ferroelectric crystal cut so that the polarization direction is in the plane of the crystal and is along the z direction is disclosed. The method includes forming a conductive ground electrode on the surface of the plane and having an edge perpendicular to the z direction or the polarization direction in the crystal plane; and electron beam bombarding the plane of the crystal in particular spots to deposit a charge such that the electric field created between the edge of the electrode and the spots is in a direction opposite to the crystal polarization direction and causing the inversion of the crystal polarization direction between the charge spot and the electrode.

REFERENCES:
patent: 5436758 (1995-07-01), Agostinelli et al.
Kiyoshi Nakamura and Hiroshi Shimizu, "Poling of Ferroelectric Crystals by Using Interdigital Electrodes and its Application to Bulk-Wave Transducers" pp. 527-530, IEEE Ultrasonics Symposium, 1983.
H. Seibert and W. Sohler, "Ferroelectric Micridomain Reversal on Y-cut LiNbO.sub.3 Surfaces", SPIE vol. 362, Physical Concepts of Materials for Novel Optoelectronic Device Applications II: Device Physics and Applications, 1990, p. 370.
R.A. Rubino, D.E. Bossi, and J.D. Farina, "A Novel Thermal Poling Technique for Fabricating QPM SHG Structures in X-cut Lithium Tantalate" in Compact Blue-Green Lasers Topical Meeting, 1992, Optical Society of America, Washington, D. C., 1992, vol. 6, pp. 75-77.

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