US5415743A
Expired / Lapsed
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Fabrication of ferroelectric domain reversals
Assignee: Fujifilm Holdings Corp
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Filing: 1993-03-03
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Granted: 1995-05-16
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Expires: 2013-03-03
Abstract
Abstract A fabrication method in which periodic domain reversals of large area are formed deeply, under improved control, over a ferroelectric which possesses the nonlinear optical effect. Proton-exchanged regions are prepared in a predetermined pattern on a unipolarized MgO-LiNbO3 substrate. An electric field is applied to these proton-exchanged regions from a high voltage power supply via a corona wire while it is subjected to a heat treatment by a heater, thereby fabricating local domain reversals.
Inventors
- 👤 Akinori Harada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:16
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/35; G02F1/355; G02F1/3558; G02F1/37
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
48 words
A fabrication method for ferroelectric domain reversals, comprising the steps of: forming a proton-exchanged region in a set pattern on a ferroelectric which possesses a unipolarized nonlinear optical effect; and heating the ferroelectric while applying an external electric field to the proton-exchanged region, thereby fabricating local domain reversals.
Claim 2
Dependent Claim
48 words
A fabrication method for ferroelectric domain reversals, comprising the steps of: forming a proton-exchanged region in a set pattern on a ferroelectric which possesses a unipolarized nonlinear optical effect; and heating the ferroelectric while applying an external electric field to the proton-exchanged region, thereby fabricating local domain reversals.
Claim 3
Dependent Claim
48 words
A fabrication method for ferroelectric domain reversals, comprising the steps of: forming a Ti-diffused region in a set pattern on a ferroelectric which possesses a unipolarized nonlinear optical effect; and heating the ferroelectric while applying an external electric field to the Ti-diffused region, thereby fabricating local domain reversals.
Claim 4
Dependent Claim
48 words
A fabrication method for ferroelectric domain reversals, comprising the steps of: forming a Ti-diffused region in a set pattern on a ferroelectric which possesses a unipolarized nonlinear optical effect; and heating the ferroelectric while applying an external electric field to the Ti-diffused region, thereby fabricating local domain reversals.
Claim 5
Dependent Claim
50 words
A fabrication method for ferroelectric domain reversals, comprising the steps of: forming an outer diffused region in a set pattern on a ferroelectric which possesses a unipolarized nonlinear optical effect; and heating the ferroelectric while applying an external electric field to the outer diffused region, thereby fabricating local domain reversals.
Claim 6
Dependent Claim
50 words
A fabrication method for ferroelectric domain reversals, comprising the steps of: forming an outer diffused region in a set pattern on a ferroelectric which possesses a unipolarized nonlinear optical effect; and heating the ferroelectric while applying an external electric field to the outer diffused region, thereby fabricating local domain reversals.
Claim 7
Dependent Claim
92 words
A fabrication method for ferroelectric domain reversals, comprising the steps of: implanting ions or atoms in a set pattern into a ferroelectric, from one end surface thereof, which possesses a unipolarized nonlinear optical effect, so that an electric conductivity of implanted region is changed; and locally inverting directions of polarization at the implanted region or the remaining region sandwiched between the implanted region and the other opposite end surface by heating the ferroelectric with a step of applying an electric field between said one end surface and the other opposite end surface.
Claim 8
Dependent Claim
92 words
A fabrication method for ferroelectric domain reversals, comprising the steps of: implanting ions or atoms in a set pattern into a ferroelectric, from one end surface thereof, which possesses a unipolarized nonlinear optical effect, so that an electric conductivity of implanted region is changed; and locally inverting directions of polarization at the implanted region or the remaining region sandwiched between the implanted region and the other opposite end surface by heating the ferroelectric with a step of applying an electric field between said one end surface and the other opposite end surface.
Claim 9
Dependent Claim
60 words
A fabrication method for ferroelectric domain reversals, comprising the steps of: irradiating light, at a wavelength enough to induce a photo refractive effect, in a set pattern over a ferroelectric which possesses a unipolarized nonlinear optical effect and the photorefractive effect; and transforming a region, where the photorefractive effect appears, into local domain reversals by applying an external electric field.
Claim 10
Dependent Claim
60 words
A fabrication method for ferroelectric domain reversals, comprising the steps of: irradiating light, at a wavelength enough to induce a photo refractive effect, in a set pattern over a ferroelectric which possesses a unipolarized nonlinear optical effect and the photorefractive effect; and transforming a region, where the photorefractive effect appears, into local domain reversals by applying an external electric field.
Claim 11
Dependent Claim
31 words
A fabrication method as defined in any one of the preceding claims 1 through 5, wherein the step of applying the electric field is applied by a corona electrical charging method.
Claim 12
Dependent Claim
41 words
A fabrication method as defined in any one of the preceding claims 1 through 5, wherein the step of applying the electric field includes applying a d.c. voltage or a pulse voltage through electrodes formed on both surfaces of the ferroelectrics.
Claim 13
Dependent Claim
51 words
A fabrication method as defined in any one of preceding claims 1 through 5, wherein the electric field applying step comprise a technique in which the ferroelectric is rapidly cooled after it has been heated, and an electric field is then applied utilizing surface electric charges produced by a pyroelectric effect.
Claim 14
Dependent Claim
88 words
A fabrication method for ferroelectric domain reversals, comprising the steps of: forming an electrode in a set pattern on one surface of a ferroelectric which possesses a unipolarized nonlinear optical effect; subjecting the ferroelectric to a corona electrical charging by means of the electrode and a corona wire disposed on the other opposite surface side of the ferroelectric; applying an electric charge to the region which has undergone the corona electrical charging; and transforming the region in opposition to the electrode of the ferroelectric into local domain reversals.
Claim 15
Dependent Claim
88 words
A fabrication method for ferroelectric domain reversals, comprising the steps of: forming an electrode in a set pattern on one surface of a ferroelectric which possesses a unipolarized nonlinear optical effect; subjecting the ferroelectric to a corona electrical charging by means of the electrode and a corona wire disposed on the other opposite surface side of the ferroelectric; applying an electric charge to the region which has undergone the corona electrical charging; and transforming the region in opposition to the electrode of the ferroelectric into local domain reversals.
Claim 16
Dependent Claim
79 words
A fabrication method for ferroelectric domain reversals, comprising the steps of: forming an electrode in a set pattern on one surface of a ferroelectric which possesses a unipolarized nonlinear optical effect; rapidly cooling the ferroelectric after the ferroelectric has been heated with the electrode thereof grounded; and transforming the region in opposition to the electrode of the ferroelectric into local domain reversals by applying an electric field to the ferroelectric utilizing surface electric charges produced by the pyroelectric effect.
Claim 17
Dependent Claim
79 words
A fabrication method for ferroelectric domain reversals, comprising the steps of: forming an electrode in a set pattern on one surface of a ferroelectric which possesses a unipolarized nonlinear optical effect; rapidly cooling the ferroelectric after the ferroelectric has been heated with the electrode thereof grounded; and transforming the region in opposition to the electrode of the ferroelectric into local domain reversals by applying an electric field to the ferroelectric utilizing surface electric charges produced by the pyroelectric effect.
Claim 18
Dependent Claim
48 words
A fabrication method for ferroelectric domain reversals in which local domain reversals are formed by applying an external electric field onto a ferroelectric having a unipolarized nonlinear optical effect, the method characterized in that an electric field is applied to the ferroelectric in dry atmosphere or under vacuum.
Claim 19
Dependent Claim
48 words
A fabrication method for ferroelectric domain reversals in which local domain reversals are formed by applying an external electric field onto a ferroelectric having a unipolarized nonlinear optical effect, the method characterized in that an electric field is applied to the ferroelectric in dry atmosphere or under vacuum.
Claim 20
Dependent Claim
19 words
A fabrication method as defined in claim 11, wherein the ferroelectric is a MgO--LiNb x Ta.sub.(1-x)O 3 (0≦×≦1) substrate.
Claim 21
Dependent Claim
36 words
A fabrication method as defined in claim 12, wherein the ferroelectric is a MgOLiNbO 3 substrate, and the ferroelectric is heated at a temperature below the Curie point after local domain reversals have been formed thereon.
Claim 22
Dependent Claim
20 words
A fabrication method as defined in claim 11, wherein the ferroelectric is a LiNb x Ta.sub.(1-x) O 3 (0≦×≦1) substrate.
Claim 23
Dependent Claim
30 words
A fabrication method as defined in claim 14, wherein the ferroelectric is heated at a temperature below the Curie point after local domain reversals have been formed on the ferroelectric.
Claim 24
Dependent Claim
34 words
A fabrication method as defined in claim 15, wherein the ferroelectric is a LiNbO 3 substrate, and wherein the heat treatment temperature is set in the range between 100° C. and 700 ° C.
Claim 25
Dependent Claim
33 words
A fabrication method as defined in claim 15, wherein the ferroelectric is a LiTaO 3 substrate, and wherein the heat treatment temperature is set in the range between 100° C. and 600° C.
References Cited (Backward Citations)
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