Researchers from Swinburne University of Technology developed a way to record holographic coding in a graphene oxide polymer composite. This may lead to very safe and secure discs that can retain the holographic information even when broke.

The researchers used an ultrashort laser beam on the graphene oxide polymer, which created a 10 to 100 times increase in the refractive-index (the measure of the bending of light as it passes through a medium) of the graphene oxide along with a decrease in its fluorescence. This offers a new mechanism for multimode optical recording.

To demonstrate this technology, the researchers encoded the image of a kangaroo in a computer generated hologram. The hologram was then rendered as a 3D recording on the graphene oxide polymer. The encrypted patterns in the hologram could not be seen as a normal microscope image, but could be retrieved in the diffracted mode.