A new holographic technique, named Micro-Reflector recording, has been unveiled by Sony according to a news published at Tech-On.
The principle described in the article at Tech-On is the following:
In the Micro-Reflector recording, light beams are irradiated on both sides of the recording medium. Two light beams are then interfered on the recording layer by aligning their focal points, thereby recording an interference fringe which corresponds to 1-bit information capacity. The information is reproduced by emitting light on the front side of the medium. Interference fringes with different depths can be recorded by changing the depth of the focal points as in the case of recording on a multilayered medium.
Among the advantages of this technoque, Sony mentioned a lower influence of heat on media and the possibility to use existing blue-violet semiconductor laser diodes, reducing so production costs using already existing factories.
This technology is still in development, but Sony claims that is possible to achieve a capacity of 500GB with twenty layers each having 25 GB density.
More details can be found at Tech-On.
