Storage of optical information using photochiroptical effect

Details Storage of optical information using photochiroptical effect Storage of optical information using photochiroptical effect

1990-02-27

1991-04-30

Michl, Paul R.

Radiation imagery chemistry: process, composition, or product th

Erasable imaging

430 20, 430495, 430945, 3461351, 428 64, 428 1, G03L 1100, G03L 100, C09K 1900, B32B 302

Patent

active

050117564

ABSTRACT:
Provided is an optical information medium which permits the reading and writing of optical information by actively using polarized light. The optical information medium comprises an information layer containing a compound which undergoes a change upon irradiation with circularly polarized light to provide a new product which is optically active, and which is distinguishable from the original compound in its interaction with polarized light. In a preferred embodiment, the optical medium comprises optical isomers which can be selectively photolyzed by circularly polarized light. While writing must be done using a circularly polarized light source, reading of the recorded information can be accomplished using either circularly polarized light or linearly polarized light.

REFERENCES:
patent: 4565779 (1986-01-01), Arakawa et al.
patent: 4753861 (1988-06-01), Tsou et al.
patent: 4853911 (1989-08-01), Yamazaki

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