Static information storage and retrieval – Information masking – Transparency
Patent
1985-11-05
1989-09-05
Fears, Terrell W.
Static information storage and retrieval
Information masking
Transparency
365120, 365121, G11C 1304
Patent
active
048645370
ABSTRACT:
A polymer and dye combination suitable for use in optically recording information. The present invention includes a material which may exhibit the property of birefringence under selected conditions such as when stretched. This birefringence can be relaxed in localized areas by heating the localized areas. Incorporated within the material is a dye. The dye is selected so that it has a high optical density, or absorption maximum, in a specific range. This range may cover, for example, the wavelength of a gallium arsenide laser. Radiation with a wavelength within the selected range is the directed into the material at selected locations. This radiation is converted to heat, which in turn relaxes the birefringence in the localized areas or may cause other physical or chemical changes within the polymer. The localized relaxation of birefringence or other change can then be detected or "read." This allows information to be optically recorded on the polymer and subsequently detected and used.
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Michl Josef
Murthy Parvathi S.
Fears Terrell W.
University of Utah
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