| 摘要 |
A high capacity three-dimensional, optically-addressed storage device comprises multiple layers 3,4,5 from which digital data stored in any given layer can be rapidly and reliably retrieved despite the proximity of data in neighbouring layers. Interrogating radiation is projected through the device orthogonally to the layers, in a flood beam or a beam defined by an electronic mask. The interrogating beam is repeatedly refocussed to reduce retrieval errors associated with beam spreading. A given layer is selected by illumination with a selecting beam projected across the layer to interact with optically sensitive material deposited at selected digital storage locations in the layer, so as to cause that material to absorb the radiation of the interrogating beam more strongly than it does in the absence of the selecting beam. |
