04471470 is referenced by 80 patents and cites 1 patents.

Methods and active media for controlled production and optical access of data in the form of physio-chemical inhomogeneities, such as controlled differences in absorption characteristics of molecules at selected regions. The methods involve use of at least two intersecting beams of radiation which are matched to selected optical properties of the active media. In a specific embodiment a bit of data at a selected portion of a region of active media is accessed by directing a first beam having a first electromagnetic radiation characteristic matched to a first optical characteristic of the media at the region to change the condition of the media to a second characteristic which is of either low or high optical reactivity, depending upon the bit value at programmed portions of the region, the second characteristic being relative to a second radiation characteristic, other than the first radiation characteristic, then directing a second beam matched to the second electromagnetic radiation characteristic to intersect the region at a selected portion containing the bit of data to be accessed to permit optical sensing of the state of the bit.

Title
Method and media for accessing data in three dimensions
Application Number
544480
Publication Number
4471470
Application Date
February 22, 1982
Publication Date
September 11, 1984
Inventor
Stephen D Kramer
Oakland
CA, US
Wyn K Swainson
Berkeley
CA, US
Agent
Townsend & Townsend
Assignee
Formigraphic Engine Corporation
FL, US
IPC
G11C 13/02
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