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Título

Rewritable phase-change optical recording in Ge₂Sb₂Te₅ films induced by picosecond laser pulses

AutorSiegel, Jan CSIC ORCID ; Schropp, A.; Solís Céspedes, Javier CSIC ORCID ; Afonso, Carmen N. CSIC ; Wuttig, Matthias
Palabras clave[PACS] Optical storage systems, optical disks
[PACS] Optical coatings
[PACS Insulators
[PACS] Constant-composition solid-solid phase transformations: polymorphic, massive, and order-disorder
[PACS] Solid-solid transitions
Fecha de publicación29-mar-2004
EditorAmerican Institute of Physics
CitaciónApplied Physics Letters, 84 (13), 2250-2252 (2004)
ResumenThe phase transformation dynamics induced in Ge₂Sb₂Te₅ 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.
Descripción3 pags. ; 2 figs.
Versión del editorhttp://dx.doi.org/10.1063/1.1689756
URIhttp://hdl.handle.net/10261/51437
DOI10.1063/1.1689756
ISSN0003-6951
E-ISSN1077-3118
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