Patent ID: 7102802
Filing Date: 2006-09-05
Classification: G03H,G11B,G11C

Abstract:
1. A method for storing holographic data, said method comprising: step (A) providing an optically transparent substrate comprising a photochemically active dye having structure (I)  wherein R  wherein X is independently at each occurrence an oxygen atom, a nitrogen atom, a sulfur atom, or a selenium atom; P step (B) irradiating the optically transparent substrate with a holographic interference pattern, wherein the pattern has a first wavelength and an intensity both sufficient to convert, within a volume element of the substrate, at least some of the photochemically active dye into a photo-product, and producing within the irradiated volume element concentration variations of the photo-product corresponding to the holographic interference pattern, thereby producing an optically readable datum corresponding to the volume element; and step (C) activating the optically transparent substrate to form an intramolecular hydrogen bond to a nitrone oxygen in residual photochemically active nitrone dye, to stabilize the optically readable datum.