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US5327448A
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Semiconductor devices and techniques for controlled optical confinement
Assignee: University of Illinois System
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Filing: 1992-03-30
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Granted: 1994-07-05
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Expires: 2012-03-30
Abstract
Abstract The disclosure is directed to improved techniques and devices employing an aluminum-bearing III-V semiconductor material and a native oxide of aluminum that is formed in the semiconductor material. Effective optical confinement, tailored to obtain desired operating conditions, can be achieved with a thick native oxide of aluminum that extends through at least one-third of the thickness of the aluminum-bearing layer in which the native oxide is formed. The resultant lateral index step can be made quite large and employed for devices such as ring lasers.
Inventors
- 👤 Nick Holonyak, Jr.
- 👤 Fred A. Kish
- 👤 Stephen J. Caracci
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 18:21
CPC Classifications
H; H10; H10P; H10P14/00; H10P14/60; H10P14/69; H10P14/692; H10P14/6938; H10P14/6939; H10P14/69391; H01; H01S; H01S5/00; H01S5/10; H01S5/1021; H10P14/63; H10P14/6302; H10P14/6304; H10P14/6306; H10P14/6312; H10P14/6322; H01S5/02; H01S5/026; H01S5/1028; H01S5/1071; H01S5/40; H01S5/4025; H01S5/4031; H01S5/4056; H01S5/4068
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
104 words
A semiconductor ring laser device; comprising: a semiconductor active region disposed between first and second semiconductor confining layers, said first and second semiconductor confining layers being of opposite conductivity type, and said first semiconductor confining layer being an aluminum-bearing III-V semiconductor material; first and second electrode means respectively coupled with said first and second confining layers, said first electrode means including a conductive annular ring; and lateral confining regions of a native oxide of aluminum formed in said first confining layer around both peripheries of said annular ring, said native oxide extending through at least most of the thickness of said first confining layer.
Claim 2
Dependent Claim
104 words
A semiconductor ring laser device; comprising: a semiconductor active region disposed between first and second semiconductor confining layers, said first and second semiconductor confining layers being of opposite conductivity type, and said first semiconductor confining layer being an aluminum-bearing III-V semiconductor material; first and second electrode means respectively coupled with said first and second confining layers, said first electrode means including a conductive annular ring; and lateral confining regions of a native oxide of aluminum formed in said first confining layer around both peripheries of said annular ring, said native oxide extending through at least most of the thickness of said first confining layer.
Claim 3
Dependent Claim
21 words
The device as defined by claim 1, wherein said native oxide extends through the entire thickness of said first confining layer.
Claim 4
Dependent Claim
23 words
The device as defined by claim 2, wherein said aluminum-bearing material comprises Al x Ga 1-x As, where x is at least 0.3.
Claim 5
Dependent Claim
40 words
The device as defined by claim 1, wherein said active region includes at least a waveguide layer and a quantum well layer, and wherein said respective electrode means are coupled to said semiconductor confining layers through further respective semiconductor layers.
Claim 6
Dependent Claim
112 words
A semiconductor laser device, comprising: a semiconductor active region disposed between first and second semiconductor confining layers, said first and second semiconductor confining layers being of opposite conductivity type, and said first semiconductor confining layer being an aluminum-bearing III-V semiconductor material; first and second electrode means respectively coupled with said first and second confining layers, said first electrode means including a conductive stripe; lateral confining regions of a native oxide of aluminum formed in said first confining layer adjacent the elongated edges of said stripe, said native oxide of aluminum having a thickness of at least 3000 Angstroms and extending through at least one-third of the thickness of said first confining layer.
Claim 7
Dependent Claim
112 words
A semiconductor laser device, comprising: a semiconductor active region disposed between first and second semiconductor confining layers, said first and second semiconductor confining layers being of opposite conductivity type, and said first semiconductor confining layer being an aluminum-bearing III-V semiconductor material; first and second electrode means respectively coupled with said first and second confining layers, said first electrode means including a conductive stripe; lateral confining regions of a native oxide of aluminum formed in said first confining layer adjacent the elongated edges of said stripe, said native oxide of aluminum having a thickness of at least 3000 Angstroms and extending through at least one-third of the thickness of said first confining layer.
Claim 8
Dependent Claim
21 words
The device as defined by claim 5, wherein said native oxide extends through at least most of said first confining layer.
Claim 9
Dependent Claim
23 words
The device as defined by claim 5, wherein said aluminum-bearing material comprises Al x Ga 1-x As, where x is at least 0.3.
Claim 10
Dependent Claim
40 words
The device as defined by claim 5, wherein said active region includes at least a waveguide layer and a quantum well layer, and wherein said respective electrode means are coupled to said semiconductor confining layers through further respective semiconductor layers.
Claim 11
Dependent Claim
85 words
A semiconductor optical waveguide, comprising: semiconductor substrate; a generally planar semiconductor waveguide layer disposed on said substrate, said waveguide layer being an aluminum-bearing III-V semiconductor material; an elongated optical path in said waveguide layer formed by said aluminum-bearing III-V semiconductor material between optically confining boundaries of native oxide of aluminum formed within the planar surface of said aluminum-bearing semiconductor material, said native oxide having a thickness of at least 3000 Angstroms and extending through at least one-third the thickness of said aluminum-bearing III-V semiconductor material.
Claim 12
Dependent Claim
85 words
A semiconductor optical waveguide, comprising: semiconductor substrate; a generally planar semiconductor waveguide layer disposed on said substrate, said waveguide layer being an aluminum-bearing III-V semiconductor material; an elongated optical path in said waveguide layer formed by said aluminum-bearing III-V semiconductor material between optically confining boundaries of native oxide of aluminum formed within the planar surface of said aluminum-bearing semiconductor material, said native oxide having a thickness of at least 3000 Angstroms and extending through at least one-third the thickness of said aluminum-bearing III-V semiconductor material.
Claim 13
Dependent Claim
17 words
The waveguide as defined by claim 9, wherein at least part of said optical path is curved.
Claim 14
Dependent Claim
23 words
The waveguide as defined by claim 9, wherein said native oxide extends through most of the thickness of said aluminum-bearing III-V semiconductor material.
Claim 15
Dependent Claim
23 words
The waveguide as defined by claim 10, wherein said native oxide extends through most of the thickness of said aluminum-bearing III-V semiconductor material.
Claim 16
Dependent Claim
23 words
The waveguide as defined by claim 9, wherein said aluminum-bearing material comprises Al x Ga 1-x As, where x is at least 0.3.
References Cited (Backward Citations)
US4176206A
Cited
US4172906A
Cited
US4291327A
Cited
US4378255A
Cited
US4511408A
Cited
US4639275A
Cited
US4817103A
Cited
JPS642318A
Cited
US5018811A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-07-04 | 1998-01-03 | 1998-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-07-04 | 2002-01-03 | 2002-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-07-04 | 2006-01-03 | 2006-07-05 | $7700.00 | Window Closed / Lapsed |