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US3887261A
Expired / Lapsed
US
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Low-loss reflection coatings using absorbing materials
Assignee: International Business Machines Corp
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Filing: 1973-03-23
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Granted: 1975-06-03
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Expires: 1993-03-23
Abstract
Abstract A class of multi-layer reflectors using a plurality of low-loss reflective elements composed of absorbing materials in the form of thin films is described wherein the differences between the absorption indices of the materials are used to obtain reflecting boundaries. The class of reflector structures are designed in such a manner that when light is directed onto the structure, a standing wave is generated throughout the structure. Absorbing materials in the nodes of the standing wave do not absorb but absorbing materials in the antinodes provide enhanced absorption.
Inventors
- 👤 Eberhard A Spiller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:10
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/08; G02B5/0891; G02B5/20; G02B5/28; G02B5/283; G02B5/285; G02B5/288
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
168 words
A reflective structure for optical waves comprising an array of alternate layers of high and low absorbing elements wherein said alternate layers are coated on top of each other, said array including a plurality of thin film elements having a relatively high absorption index separated by and coated on material having a relatively low absorption index to provide an alternating difference in said absorption indices to produce a plurality of reflecting boundaries which, when positioned in the path of an incident optical wave produce standing incident and reflected waves as a result of said differences in said absorption indices, said alternate layers being arranged relative to each other so that said high absorption elements are located in the nodes of said incident and reflected waves to form a nonperiodic structure wherein the thickness of the absorbing layers monotonically vary from one end of said array to the other, said thinner absorbing layers being located at the end of said array in the path of said incident optical wave.
Claim 2
Dependent Claim
168 words
A reflective structure for optical waves comprising an array of alternate layers of high and low absorbing elements wherein said alternate layers are coated on top of each other, said array including a plurality of thin film elements having a relatively high absorption index separated by and coated on material having a relatively low absorption index to provide an alternating difference in said absorption indices to produce a plurality of reflecting boundaries which, when positioned in the path of an incident optical wave produce standing incident and reflected waves as a result of said differences in said absorption indices, said alternate layers being arranged relative to each other so that said high absorption elements are located in the nodes of said incident and reflected waves to form a nonperiodic structure wherein the thickness of the absorbing layers monotonically vary from one end of said array to the other, said thinner absorbing layers being located at the end of said array in the path of said incident optical wave.
References Cited (Backward Citations)
US3428388A
Cited
US3712980A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |