Patent EP0486769A2 successfully refreshed from Google Patents.
EP0486769A2
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Polarized optical waveguide and method for manufacturing the same
Assignee: Sony Corp
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Filing: 1991-08-21
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Granted: —
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Expires: 2011-08-21
Abstract
Abstract An optical waveguide, a dielectric device and method for fabricating such devices in which a substrate (1) polarized in a first direction and a dielectric thin film (2) formed on the surface of the substrate and polarized in the opposite direction to the substrate. Parallel grooves (1a) may be formed in the substrate (1). In one embodiment, a first dielectric thin film (2) is formed on the substrate (1) and is formed with grooves (2a) and is polarized in the same direction as the substrate (1). Then, a second dielectric thin film (3) is formed over the first dielectric thin film (2) and it is polarized in a direction which is opposite to the substrate (1) and the first thin film (2). <IMAGE>
Inventors
- 👤 Hitoshi Tamada
- 👤 Atsuo Yamada
- 👤 Yukie Taneyama
- 👤 Masaki Saitoh
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 05:01
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/35; G02F1/355; G02F1/3558; G02F1/37; G02F1/377; G02F1/3775; G02F2202/00; G02F2202/20; Y; Y10; Y10S; Y10S117/00; Y10S117/918
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
73 words
An optical waveguide comprising: a dielectric crystal substrate (1) polarized in one direction; and a dielectric crystal thin film (2) formed over one major surface of said dielectric crystal substrate by a liquid-phase epitaxial growth process and which is polarized in a direction which is opposite to the direction of polarization of the dielectric crystal substrate and having a Curie temperature which is higher than a temperature for the liquid-phase epitaxial growth process.
Claim 2
Independent Claim
69 words
A method of fabricating an optical waveguide, comprising the steps of forming by a liquid-phase epitaxial growth process over one major surface of a dielectric crystal substrate, a dielectric crystal thin film which is polarized in a direction which is opposite to the direction of polarization of the dielectric crystal substrate and which has a Curie temperature which is higher than the temperature used for the epitaxial growth process.
Claim 3
Dependent Claim
88 words
An optical waveguide comprising: a dielectric crystal substrate which is polarized in one direction and which is provided with parallel grooves in a predetermined arrangement in one major surface thereof; and a dielectric crystal thin film formed over said major surface of the dielectric crystal substrate by a liquid-phase epitaxial growth process and polarized in a direction which is opposite to the direction of polarization of the dielectric crystal substrate and which has a Curie temperature which is higher than the temperature used for the epitaxial growth process.
Claim 4
Independent Claim
87 words
A method of fabricating an optical waveguide, comprising the steps of, forming by a liquid-phase epitaxial growth process over one major surface which is provided with parallel grooves in a predetermined arrangement of a dielectric crystal substrate and which is polarized in one direction, a dielectric crystal thin film which is polarized in a direction which is opposite to the direction of polarization of the dielectric crystal substrate and which has a Curie temperature which is higher than the temperature used for the liquid-phase epitaxial growth process.
Claim 5
Dependent Claim
142 words
An optical waveguide comprising: a dielectric crystal substrate which is polarized in one direction; a first dielectric crystal thin film formed by a liquid-phase epitaxial growth process over one major surface of the dielectric crystal substrate and provided in the major surface thereof with parallel grooves in a predetermined arrangement, and which is polarized in the direction of polarization of the dielectric crystal substrate and has a Curie temperature which is higher than the temperature for the liquid-phase epitaxial growth process; and a second dielectric crystal thin film formed by a liquid-phase epitaxial growth process over said major surface of the first dielectric crystal thin film and polarized in a direction which is opposite to the direction of polarization of said dielectric crystal substrate and which has a Curie temperature which is higher than the temperature for the liquid-phase epitaxial growth process.
Claim 6
Independent Claim
145 words
A method of fabricating an optical waveguide comprising the steps of: forming by a liquid-phase epitaxial growth process over one major surface of a dielectric crystal substrate which is polarized in one direction, a first dielectric crystal thin film which is polarized in a direction which is opposite to the polarization of the dielectric crystal substrate and which has a Curie temperature which is higher than the temperature for the liquid-phase epitaxial growth process; inverting the polarity of the first dielectric crystal thin film; forming grooves in a predetermined parallel arrangement in the major surface of the first dielectric crystal thin film; and forming a second dielectric crystal thin film which is polarized in a direction which is opposite the direction of polarization of the dielectric crystal substrate over the major surface of the first dielectric crystal thin film by a liquid-phase epitaxial growth process.
Claim 7
Dependent Claim
72 words
A piezoelectric device comprising: a dielectric crystal substrate which is polarized in one direction; and a dielectric crystal thin film formed over one major surface of the dielectric crystal substrate by a liquid-phase epitaxial growth process and polarized in a direction which is opposite to the direction of polarization of the dielectric crystal substrate and which has a Curie temperature which is higher than the temperature for the liquid-phase epitaxial growth process.
Claim 8
Dependent Claim
54 words
A dielectric device comprising: a substrate which is polarized in a first direction and formed with a plurality of parallel grooves on a major surface thereof, and a dielectric film formed on said major surface over said grooves and polarized in a direction which is opposite to the direction of polarization of said substrate.
Claim 9
Dependent Claim
21 words
A dielectric device according to claim 8 wherein said dielectric film is only slightly thicker than the depth of said grooves.
References Cited (Backward Citations)
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