Method for storing holographic data

G - Physics – 11 – B

Patent

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G11B 7/0065 (2006.01) G03H 1/02 (2006.01) G11B 7/245 (2006.01)

Patent

CA 2663380

A method for storing holographic data, said method comprising: step (A) providing an optically transparent substrate comprising a polymer composition and a light absorbing chromophore, said polymer composition comprising a continuous phase and a dispersed phase, said dispersed phase being less than about 200 nm in size; and step (B) irradiating a volume element of the optically transparent substrate with a holographic interference pattern, wherein the pattern has a first wavelength and an intensity both sufficient to cause a phase change in at least a portion of the dispersed phase within the volume element of the substrate to produce within the irradiated volume element refractive index variations corresponding to the holographic interference pattern, thereby producing an optically readable datum corresponding to the volume element.

L'invention concerne un procédé de stockage de données holographiques; ledit procédé consiste à (A) fournir un substrat optiquement transparent comprenant une composition polymère et un chromophore absorbant la lumière, ladite composition polymère comprenant une phase continue et une phase dispersée, ladite phase dispersée étant de dimension environ inférieure à 200 nm; et à (B) irradier un élément de volume du substrat optiquement transparent avec un motif d'interférence holographique, ledit motif ayant une première longueur d'onde et une intensité, toutes deux suffisantes pour provoquer un changement de phase dans au moins une partie de la phase dispersée de l'élément de volume du substrat, pour produire dans l'élément de volume irradié, des variations d'indice de réfraction correspondant au motif d'interférence holographique, ce qui permet de produire une donnée lisible optiquement correspondant à l'élément de volume.

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