We develop a theory of the crystallization dynamics of Ge<sub>2</sub>Sb<sub>2.3</sub>Te<sub>5</sub> thin films that shows good qualitative agreement with experimental reflectivity results from a two-laser static tester. The theory is adapted from the nucleation theory of liquid droplets from supersaturated vapor and elucidates the physics underlying the amorphous-to-crystalline phase transformation under short-pulse excitation. In particular, the theory provides a physical picture in which crystalline islands, or basic embryos, are thermally activated in the amorphous material and subsequently grow as stable nuclei are formed.
© 2000 Optical Society of America
(210.0210) Optical data storage : Optical data storage
(210.4590) Optical data storage : Optical disks
(210.4770) Optical data storage : Optical recording
(210.4810) Optical data storage : Optical storage-recording materials
Ewan M. Wright, Pramod K. Khulbe, and Masud Mansuripur, "Dynamic Theory of Crystallization in Ge2Sb2.3Te5 Phase-Change Optical Recording Media," Appl. Opt. 39, 6695-6701 (2000)