US5734174A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photo hole burning memory
Assignee: Fujitsu Ltd
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Filing: 1996-09-06
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Granted: 1998-03-31
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Expires: 2016-09-06
Abstract
Abstract A photo hole burning memory device includes a quantum dot and a quantum well layer cooperating with the quantum dot for storing information and a periodic structure that creates a photonic bandgap, wherein the periodic structure includes a local irregularity that forms a level in the photonic bandgap.
Inventors
- 👤 Naoto Horiguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:17
CPC Classifications
B; B82; B82Y; B82Y10/00; G; G11; G11B; G11B7/00; G11B7/004; G11B7/0045; G11B7/005; G11B7/0055; G11B7/24; H; H10; H10D; H10D62/00; H10D62/80; H10D62/81; H10D62/812; H10D62/814
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
167 words
A photo hole burning memory device comprising: a quantum dot layer including a plurality of quantum dots each forming a quantum level in said quantum dot layer, each of said quantum dots absorbing an optical radiation having an energy corresponding to said quantum level and creating an electron-hole pair in response thereto; a periodic structure provided in said quantum dot layer for creating a photonic bandgap including therein an absorption energy of said quantum dot; an information retention layer provided adjacent to said quantum dot layer, said information retention layer including a quantum well having a quantum level lower than said quantum level of said quantum dots; a tunneling barrier layer interposed between said quantum dot layer and said information retention layer, said tunneling barrier layer forming a potential barrier, said tunneling barrier layer having a thickness that allows a passage of electrons therethrough by tunneling; and a biasing electrode structure for applying a biasing electric field to said quantum dot layer and said information retention layer.
Claim 2
Dependent Claim
167 words
A photo hole burning memory device comprising: a quantum dot layer including a plurality of quantum dots each forming a quantum level in said quantum dot layer, each of said quantum dots absorbing an optical radiation having an energy corresponding to said quantum level and creating an electron-hole pair in response thereto; a periodic structure provided in said quantum dot layer for creating a photonic bandgap including therein an absorption energy of said quantum dot; an information retention layer provided adjacent to said quantum dot layer, said information retention layer including a quantum well having a quantum level lower than said quantum level of said quantum dots; a tunneling barrier layer interposed between said quantum dot layer and said information retention layer, said tunneling barrier layer forming a potential barrier, said tunneling barrier layer having a thickness that allows a passage of electrons therethrough by tunneling; and a biasing electrode structure for applying a biasing electric field to said quantum dot layer and said information retention layer.
Claim 3
Dependent Claim
29 words
A photo hole burning memory device as claimed in claim 1, wherein said periodic structure includes an irregularity such that said irregularity forms a level in said photonic bandgap.
Claim 4
Dependent Claim
22 words
A photo hole burning memory device as claimed in claim 1, wherein said periodic structure includes a one-dimensional periodic structure repeated one-dimensionally.
Claim 5
Dependent Claim
22 words
A photo hole burning memory device as claimed in claim 1, wherein said periodic structure includes a two-dimensional periodic structure repeated two-dimensionally.
Claim 6
Dependent Claim
22 words
A photo hole burning memory device as claimed in claim 1, wherein said periodic structure includes a three-dimensional periodic structure repeated three-dimensionally.
Claim 7
Dependent Claim
26 words
A photo hole burning memory device as claimed in claim 1, wherein said information retention layer comprises a semiconductor material causing an indirect transition of carriers.
Claim 8
Dependent Claim
53 words
A photo hole burning memory device as claimed in claim 6, wherein said information retention layer includes a Γ valley and an X valley, said X valley having an energy level lower than an energy level of said Γ valley, said X valley thereby forming said quantum well in said information retention layer.
Claim 9
Dependent Claim
52 words
A photo hole burning memory device as claimed in claim 1, wherein said photo hole burning memory device further includes an intermediate layer disposed between said quantum dot layer and said information retention layer, said intermediate layer including a quantum well having an energy larger than an energy of said quantum dots.
Claim 10
Dependent Claim
51 words
A photo hole burning memory device as claimed in claim 1, wherein said photo hole burning memory device further includes an intermediate layer disposed between said quantum dot layer and said information retention layer, said intermediate layer including quantum dots having an energy larger than an energy of said quantum dots.
Claim 11
Dependent Claim
110 words
A photo hole burning memory device as claimed in claim 1, wherein said electrode structure includes a plurality of first electrodes disposed on a first side of a layered semiconductor body forming said photo hole burning memory device and a plurality of second electrodes disposed on a second, opposite side of said layered semiconductor body, said layered semiconductor body including therein said quantum dot layer, said tunneling barrier layer and said information retention layer; said quantum dot layer including therein a plurality of said quantum dots in each area where one of said first electrodes intersect with one of said second electrodes when viewed perpendicularly to said layered semiconductor body.
References Cited (Backward Citations)
US5663571A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-03-30 | 2001-09-29 | 2002-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-03-30 | 2005-09-29 | 2006-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-03-30 | 2009-09-29 | 2010-03-31 | $7700.00 | Window Closed / Lapsed |