Optical memories, method for reading and writing such...

Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam

Reexamination Certificate

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C369S284000

Reexamination Certificate

active

07983117

ABSTRACT:
The invention concerns a optical data memory, said memory comprising at least one layer of supporting material, said supporting material including molecules having, in a local zone, a collective state of molecules from at least one first collective state of molecules, and a second collective state of molecules. The invention is characterized in that only molecules having the first collective state of molecules in said local zone are capable of generating a second-harmonic signal when they are excited in said local zone by a reading electromagnetic radiation.

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patent: 0 295 145 (1988-12-01), None
patent: 0 397 545 (1990-11-01), None
R. A. Hill, et al., “Reversible optical storage utilizing pulsed, photoinduced, electric-field-assisted reorientation of azobenzenes”, Applied Physics Letters, AIP, American Institute of Physics, Melville, NY, US, vol. 66, No. 17, Apr. 24, 1995, pp. 2156-2158, XP012012608, ISSN: 0003-6951.
A. Petri, et al., “Photoinduced Reorientation of Cholesteric Liquid Crystalline Polysiloxanes and Applications in Optical Information Storage and Second Harmonic Generation,” Ber. Bunsenges. Phys. Chem. vol. 97, No. 10, 1993, pp. 1281-1286, XP002412002.

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