US5117477A
Expired / Lapsed
US
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Optical functioning element using a transparent substrate with matching lattice constant
Assignee: Ricoh Research Institute of General Electronics Co Ltd
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Filing: 1991-01-25
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Granted: 1992-05-26
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Expires: 2011-01-25
Abstract
Abstract An optical functioning element comprising: an optical functional element having a layer-stacked structure including a crystalline substance layer; a substrate for mounting the optical functional element; and an epitaxial growth layer of the crystalline substance formed between the optical functional element and the substrate. The substrate becomes transparent with respect to the light accessible to the optical functional element so that it becomes possible to optically access the functional element from both sides of the substrate without partly removing the substrate for passing through the light.
Inventors
- 👤 Shiro Satoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:23
CPC Classifications
H; H10; H10H; H10H20/00; H10H20/01; H10H20/011; H10H20/013; H10H20/0133; H10F; H10F55/00; H10F55/18; H01; H01S; H01S5/00; H01S5/02; H01S5/0206; H01S5/0213; H01S5/10; H01S5/18; H01S5/183; H01S5/50; H01S5/5045
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
204 words
An optical functioning element having at least one of a light emitting function, a light receiving function and a light modulating function, said optical functioning element comprising: an optical element for carrying out said at least one function, having a layer-stacked structure of crystalline substance layers, each of which is selected from a group consisting of GaAs, AlGaAs and AlAs, said layer-stacked structure including at least one junction formed by different conductive type layers; a substrate of a single crystal substance for mounting said optical element on an upper face thereof, said substrate being transparent with respect to a wavelength of light emitted from said optical element or to which said optical element is photosensitive to allow said optical element to emit or receive said wavelength of light through said substrate; and an epitaxial growth layer of Al x Ga 1-x As,0≦x≦1, having a first lattice constant and formed between said optical element and said substrate, wherein the single crystal substance of said substrate has a second lattice constant such that the difference between said first lattice constant and said second lattice constant is small enough such that a lattice structure of said substrate matches with a lattice structure of said epitaxial growth layer.
Claim 2
Dependent Claim
204 words
An optical functioning element having at least one of a light emitting function, a light receiving function and a light modulating function, said optical functioning element comprising: an optical element for carrying out said at least one function, having a layer-stacked structure of crystalline substance layers, each of which is selected from a group consisting of GaAs, AlGaAs and AlAs, said layer-stacked structure including at least one junction formed by different conductive type layers; a substrate of a single crystal substance for mounting said optical element on an upper face thereof, said substrate being transparent with respect to a wavelength of light emitted from said optical element or to which said optical element is photosensitive to allow said optical element to emit or receive said wavelength of light through said substrate; and an epitaxial growth layer of Al x Ga 1-x As,0≦x≦1, having a first lattice constant and formed between said optical element and said substrate, wherein the single crystal substance of said substrate has a second lattice constant such that the difference between said first lattice constant and said second lattice constant is small enough such that a lattice structure of said substrate matches with a lattice structure of said epitaxial growth layer.
Claim 3
Dependent Claim
25 words
An optical functioning element according to claim 1, wherein said difference between said first lattice constant and said second lattice constant is less than 4%.
Claim 4
Dependent Claim
29 words
An optical functioning element according to claim 2, wherein said single crystal substance of said substrate is selected from a group consisting of CaF 2 and SrF 2 .
Claim 5
Dependent Claim
25 words
An optical functioning element according to claim 2, wherein said difference between said first lattice constant and said second lattice constant is less than 0.4%.
Claim 6
Dependent Claim
31 words
An optical functioning element according to claim 4, wherein said single crystal substance of said substrate is selected from a group consisting of ZnSe and ZnS y Se 1-y , 0<y<0.13.
Claim 7
Dependent Claim
23 words
An optical functioning element according to claim 5, wherein said single crystal substance of said substrate is ZnS y Se 1-y , 0.05<y<0.10.
Claim 8
Dependent Claim
38 words
An optical functioning element according to claim 4, wherein said single crystal substance of said substrate is ZnSe, and a layer of ZnS y Se 1-y , 0<y<0.13, is inserted between said substrate and said epitaxial growth layer.
Claim 9
Dependent Claim
42 words
An optical functioning element according to claim 4, wherein said single crystal substance of said substrate is ZnSe, and a super lattice layer composed of a ZnSSe layer and a ZnSe layer, is inserted between said substrate and said epitaxial growth layer.
Claim 10
Dependent Claim
42 words
An optical functioning element according to claim 1, wherein said epitaxial growth layer is a super lattice layer composed of two layers wherein said two layers consist of GaAs and AlGaAs, GaAs and AlAs, two different AlGaAs layers, or AlGaAs and AlAs.
Claim 11
Dependent Claim
38 words
An optical functioning element according to claim 1, wherein said substrate has a forbidden band width corresponding to an energy value larger than an energy corresponding to a peak wavelength of an optical output from said optical element.
Claim 12
Dependent Claim
35 words
An optical functioning element according to claim 1, wherein said substrate has a forbidden band width corresponding to an energy value larger than an optical energy of light to which said optical element is sensitive.
Claim 13
Dependent Claim
26 words
An optical functioning element according to claim 1, wherein a plurality of said optical elements are formed on said substrate to constitute a monolithic array device.
Claim 14
Dependent Claim
17 words
An optical functioning element according to claim 1, wherein said junction emits light by passing current therethrough.
Claim 15
Dependent Claim
17 words
An optical functioning element according to claim 1, wherein said junction receives light to thereby generate photo-current.
Claim 16
Dependent Claim
29 words
An optical functioning element according to claim 13 or 14, wherein said substrate has an electrode on a lower face thereof and said optical element has another electrode thereon.
Claim 17
Dependent Claim
29 words
An optical functioning element according to claim 13 or 14, wherein said substrate has an electrode on said upper face thereof and said optical element has another electrode thereon.
References Cited (Backward Citations)
US3962714A
Cited
US4212020A
Cited
US4318059A
Cited
US4607370A
Cited
JPS61166190A
Cited
US4791636A
Cited
US4996163A
Cited
US5014096A
Cited
US4990970A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1995-05-26 | 1995-11-25 | 1996-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-05-26 | 1999-11-25 | 2000-05-26 | $3760.00 | Window Closed / Lapsed |
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