Rewritable phase-change optical recording in Ge[sub 2]Sb[sub 2]Te[sub 5] films induced by picosecond laser pulses

Siegel, J.; Schropp, A.; Solis, J.; Afonso, C.N.; Wuttig, M.
March 2004
Applied Physics Letters;3/29/2004, Vol. 84 Issue 13, p2250
Academic Journal
The phase transformation dynamics induced in Ge[sub 2]Sb[sub 2]Te[sub 5] films by picosecond laser pulses were studied using real-time reflectivity measurements with subnanosecond resolution. Evidence was found that the thermal diffusivity of the substrate plays a crucial role in determining the ability of the films to crystallize and amorphize. A film/substrate configuration with optimized heat flow conditions for ultrafast phase cycling with picosecond laser pulses was designed and produced. In this system, we achieved reversible phase transformations with large optical contrast (>20%) using single laser pulses with a duration of 30 ps within well-defined fluence windows. The amorphization (writing) process is completed within less than 1 ns, whereas crystallization (erasing) needs approximately 13 ns to be completed. © 2004 American Institute of Physics.


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