Light-transmissive data storage sandwich
The present invention teaches a methodology and apparatus for data storage using elements of data sets stored as standing waves of a plurality of wavelengths in an optical photosensitive medium. A selector chooses the locations wherein the combinations of standing waves are stored. The medium is read in transmission mode with select standing waves acting as notch filter.
1. A light-transmissive data storage sandwich apparatus for storing digital data in an optical data storage medium layer, the device comprising:
a set of monochromatic light sources of preselected wavelengths;
a diffusing layer, coupled to the set of monochromatic light sources, configured to uniformly distribute light from the light sources;
a beam directing layer having a rear surface, the beam directing layer coupled to the diffusing layer, configured to redirect light from the diffusing layer in a direction perpendicular to the rear surface;
a pixel selector layer, having an rear surface, the pixel selector layer coupled to the rear surface of the beam directing layer and configured to define a set of masks that selectively inhibits transmission of light, on a pixel-by-pixel basis, at a wavelength of interest; and,
the optical data storage medium layer applied to output surface of the pixel selector layer.
2. A light-transmissive data storage sandwich apparatus according to claim 1 , wherein the optical data storage medium layer is a Lippmann emulsion.
3. A light-transmissive data storage sandwich apparatus according to claim 1 , wherein the optical data storage medium layer is a photopolymer medium.
4. A light-transmissive data storage sandwich apparatus according to claim 1 wherein the optical data storage medium layer is a holographic medium.
5. A light-transmissive data storage sandwich apparatus according to claim 1 , wherein the pixel selector layer has a rear surface facing the sensor layer and the optical data storage medium layer is on the rear surface of the pixel selector layer, is a removable module for processing the optical data storage medium layer.
6. A light-transmissive data storage sandwich apparatus for reading digital data stored in an optical data storage medium layer, the apparatus comprising:
a set of light sources of predetermined wavelengths;
a diffusing layer configured to uniformly distribute light from the light sources;
an exposed optical data storage medium layer embedding standing waves acting as notch filters;
a beam directing layer, disposed between the diffusing layer and the optical data storage medium layer, the beam directing layer having a rear surface and configured to redirect light from the diffusing layer in a direction perpendicular to the rear surface, so as to reach the optical data storage medium layer;
a pixel selector layer which in reading mode is transparent;
a sensor layer to detect the select pixel locations attenuated by the standing waves.
7. A light-transmissive data storage sandwich apparatus according to claim 6 , wherein the transparent pixel selector layer has a rear surface facing the sensor layer and the exposed optical data storage medium layer is on the rear surface of the pixel selector layer.
8. A light-transmissive data storage sandwich apparatus according to claim 7 , wherein the transparent pixel selector layer, with the exposed optical data storage medium layer applied to its rear surface, is configured as a removable module.