Discs currently have three spatial dimensions.By using gold nanorods Gu and colleagues were able to add two additional dimensions, one based on the colour spectrum, and the other on polarisation.

• 因为纳米颗粒是通过他们的形状来反射光线，所以在光盘的同一位置，根据一系列的颜色的波长的不同，来存贮不同的信息就成为可能。