Laser-Induced Modification of the Surface of Ge2Sb2Te5 Thin Films: Phase Changes and Periodic-Structure Formation
- Autores: Yakovlev S.1, Ankudinov A.1,2, Vorobyov Y.3, Voronov M.1, Kozyukhin S.4, Melekh B.1, Pevtsov A.1
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Afiliações:
- Ioffe Institute
- St. Petersburg National Research University of Information Technologies, Mechanics, and Optics
- Ryazan State Radio Engineering University
- Kurnakov Institute of General and Inorganic Chemistry
- Edição: Volume 52, Nº 6 (2018)
- Páginas: 809-815
- Seção: Fabrication, Treatment, and Testing of Materials and Structures
- URL: https://journals.rcsi.science/1063-7826/article/view/203566
- DOI: https://doi.org/10.1134/S1063782618060246
- ID: 203566
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Resumo
Submicron periodic lattices are formed at the surface of phase-change-memory film materials based on the complex chalcogenide Ge2Sb2Te5 when exposed to nanosecond laser pulses. The geometric characteristics and structural properties of laser-induced lattices are studied by optical and atomic-force microscopies and Raman spectroscopy. It is shown that, at appropriately chosen parameters of exposure to laser radiation, it is possible to implement periodic modulation of the refractive index in the structures formed. Modulation is due to the postexposure solidification of grating ridges and valleys in different phase states, whose dielectric constants widely differ from each other. In the vicinity of the maxima of the wavy structure, the amorphous state is mainly formed, whereas in the region of minima, the Ge2Sb2Te5 structure corresponds mainly to the crystalline phase.
Sobre autores
S. Yakovlev
Ioffe Institute
Email: pevtsov@gvg.ioffe.ru
Rússia, St. Petersburg, 194021
A. Ankudinov
Ioffe Institute; St. Petersburg National Research University of Information Technologies, Mechanics, and Optics
Email: pevtsov@gvg.ioffe.ru
Rússia, St. Petersburg, 194021; St. Petersburg, 197101
Yu. Vorobyov
Ryazan State Radio Engineering University
Email: pevtsov@gvg.ioffe.ru
Rússia, Ryazan, 390005
M. Voronov
Ioffe Institute
Email: pevtsov@gvg.ioffe.ru
Rússia, St. Petersburg, 194021
S. Kozyukhin
Kurnakov Institute of General and Inorganic Chemistry
Email: pevtsov@gvg.ioffe.ru
Rússia, Moscow, 119991
B. Melekh
Ioffe Institute
Email: pevtsov@gvg.ioffe.ru
Rússia, St. Petersburg, 194021
A. Pevtsov
Ioffe Institute
Autor responsável pela correspondência
Email: pevtsov@gvg.ioffe.ru
Rússia, St. Petersburg, 194021