Method of bistable optical information storage using antiferroel

Details Method of bistable optical information storage using antiferroel Method of bistable optical information storage using antiferroel

1988-05-31

1990-07-31

Gossage, Glenn A.

Static information storage and retrieval

Radiant energy

Ferroelectric

365145, 365121, 350374, G11C 1122

Patent

active

049455141

ABSTRACT:
A method for bistable storage of binary optical information includes an antiferroelectric (AFE) lead lanthanum zirconate titanate (PLZT) layer having a stable antiferroelectric first phase and a ferroelectric (FE) second phase obtained by applying a switching electric field across the surface of the device. Optical information is stored by illuminating selected portions of the layer to photoactivate an FE to AFE transition in those portions. Erasure of the stored information is obtained by reapplying the switching field.

REFERENCES:
patent: 3978458 (1976-08-01), Vergnolle et al.
patent: 3998523 (1976-12-01), Otomo
Kumada et al., "An Electro-Optic Image Storage Device Using Field Induced Reversible Transitions Between AFE and FE Phases of PLZT Ceramics", Ferroelectrics, vol. 7, 1974, pp. 367-369.
Land et al., "Photoferroelectric Image Storage in PLZT Ceramics", Information Display, Spring 1977, pp. 20-23, 26.

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