Rewriteable holographic memory sees the light

Scientists have managed to write, erase and rewrite data onto protein molecules to demonstrate what could be one of the first examples of fast rewriteable holographic memory.

Holographic memory stores data in three dimensions at a far higher density than conventional memory with read speeds hundreds of times faster. Companies such as InPhase have demonstrated commercial holographic storage systems but rewriteable media are not yet available.

Researchers at the University of Connecticut have managed to write data onto re-engineered versions of proteins produced by bacteria-like organisms, reports MIT Technology Review

The researchers noted that the protein, bacteriorhodopsin, helps organisms convert sunlight into energy via certain stages. The ability to absorb light allows it to create holograms and although the whole cycle takes just 10-20 milliseconds, they found that shining a red light on the protein at a certain stage can extend that useful hologram stage - the Q Stage - for years.

In tests, the researchers suspended the protein a polymer gel and targeted it with a green laser beam which is split in two, with one beam carrying the data. The beams are reunited in the gel to imprint the protein with an interference pattern that stores the data. The data can be read using a red laser beam on the pattern, while a blue laser erases the data.

"Protein-based holographic media has the potential for low-cost removable media rewriteable up to 10 million times, commented Tim Harvey, CEO of Starzent, talking to Technology Review. Starzent is currently creating a miniature holographic data storage drive.

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