Static information storage and retrieval – Radiant energy
Patent
1990-08-27
1991-08-06
Levy, Stuart S.
Static information storage and retrieval
Radiant energy
365110, 365114, 369 13, G11C 1300, G11B 1100
Patent
active
050383213
ABSTRACT:
An erasable electro-optic storage disk for use in focused laser beam operated data handling systems comprises a semiconductor substrate with a storage layer arranged on top of it that is capable of trapping charge carriers. Electric contacts are connected to the semiconductor substrate and to the storage layer, respectively. An energy barrier with associated depletion zone is formed in the substrate near the interface with the storage layer. Upon simultaneous application of a control voltage to the contacts and of a focused laser beam directed at a storage site, electron pairs are generated in the depletion zone, and charge carriers are transferred towards the interface. This causes a reduction of the depletion zone and thus of the voltage over the depletion zone, and an increase of the field in the storage layer, whereby charge carriers are injected into and trapped in the storage layer; method of recording, reading data and apparatus therefor.
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Anderson F. E.
International Business Machines - Corporation
Levy Stuart S.
Nguyen Hoa
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