Light-based memory chip is the first ever to store data permanently

[Dexter]

http://www.sciencedaily.com/releases/2015/10/151004112856.htm

The world's first entirely light-based memory chip to store data permanently has been developed by material scientists at Oxford University in collaboration with scientists at Karlsruhe, Munster and Exeter. The device, which makes use of materials used in CDs and DVDs, could help dramatically improve the speed of modern computing.