Phase Change Materials: Optical Storage

Phase Change Materials: Optical Storage

Author: W. Bensch, M. Wuttig

The information in DVDs and Blu-Ray discs is stored in a thin layer of tellurium based materials.

By using short laser pulses with appropriate energy, the material can be reversibly switched between the crystalline and amorphous states.

The two states exhibit a pronounced optical and electrical contrast making this class of materials – often termed as phase change materials – unique.

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