Static information storage and retrieval – Radiant energy
Patent
1991-07-22
1994-02-22
Popek, Joseph A.
Static information storage and retrieval
Radiant energy
365127, G11C 1142, G11C 1304
Patent
active
052894070
ABSTRACT:
In a method of high density (>10.sup.12 bits/cc) optical recording of information in a three-dimensional multilayered format, information is written in a photopolymer as submicron volume elements of altered index of refraction. The index change results from alteration of the photopolymer induced by two-photon excitation of the photo-sensitizer at the waist of a highly focused beam from a subpicosecond colliding pulse modelocked laser. Quadratic dependence of two-photon excitation on incident instantaneous intensity serves to confine crosslinking of the polymer to the focal volume; hence, bit array layers may be written with thicknesses on the order of the confocal parameter. As an example, eight well resolved bit planes can be written in a olymer film about 30 microns thick. Information written in this manner may be read with sufficient axial resolution by differential interference contrast (DIC) or confocal microscopy. This technique may be employed in multilayered write once read many (WORM) optical storage discs, for example.
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Strickler James H.
Webb Watt W.
Cornell Research Foundation Inc.
Popek Joseph A.
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