A Japanese research team has found a material that could be used to make a low-price super disc with data storage capacity thousands of times greater than a DVD, the lead scientist said Monday.
The material transforms from a black-colour metal state that conducts electricity into a brown semiconductor when hit by light, according to Shin-ichi Ohkoshi, chemistry professor at the University of Tokyo.
The material, a new crystal form of titanium oxide, can switch back and forth between the metal and semiconductor states at room temperature when exposed to light, creating an effective on-off function for data storage.
It is “promising as a material for a next-generation optical storage device,” Ohkoshi told AFP by telephone.
A material that changes colour with light can be used in storage devices as colours reflect light differently to contain different information.
His team has succeeded in creating the material in particles measuring five-to-20 nanometres a five-billionth to 20-billionth of a metre in diameter.
If the smallest particle is used, the new disc could hold more than 1,000 times as much information as a Blu-ray disc, provided that matching data-writing and reading equipment are developed.