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Ultrafast time-resolved electron diffraction revealing the nonthermal dynamics of near-UV photoexcitation-induced amorphization in Ge(2)Sb(2)Te(5)
Because of their robust switching capability, chalcogenide glass materials have been used for a wide range of applications, including optical storages devices. These phase transitions are achieved by laser irradiation via thermal processes. Recent studies have suggested the potential of nonthermal p...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group
2015
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4551965/ https://www.ncbi.nlm.nih.gov/pubmed/26314613 http://dx.doi.org/10.1038/srep13530 |
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author | Hada, Masaki Oba, Wataru Kuwahara, Masashi Katayama, Ikufumi Saiki, Toshiharu Takeda, Jun Nakamura, Kazutaka G. |
author_facet | Hada, Masaki Oba, Wataru Kuwahara, Masashi Katayama, Ikufumi Saiki, Toshiharu Takeda, Jun Nakamura, Kazutaka G. |
author_sort | Hada, Masaki |
collection | PubMed |
description | Because of their robust switching capability, chalcogenide glass materials have been used for a wide range of applications, including optical storages devices. These phase transitions are achieved by laser irradiation via thermal processes. Recent studies have suggested the potential of nonthermal phase transitions in the chalcogenide glass material Ge(2)Sb(2)Te(5) triggered by ultrashort optical pulses; however, a detailed understanding of the amorphization and damage mechanisms governed by nonthermal processes is still lacking. Here we performed ultrafast time-resolved electron diffraction and single-shot optical pump-probe measurements followed by femtosecond near-ultraviolet pulse irradiation to study the structural dynamics of polycrystalline Ge(2)Sb(2)Te(5). The experimental results present a nonthermal crystal-to-amorphous phase transition of Ge(2)Sb(2)Te(5) initiated by the displacements of Ge atoms. Above the fluence threshold, we found that the permanent amorphization caused by multi-displacement effects is accompanied by a partial hexagonal crystallization. |
format | Online Article Text |
id | pubmed-4551965 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2015 |
publisher | Nature Publishing Group |
record_format | MEDLINE/PubMed |
spelling | pubmed-45519652015-09-04 Ultrafast time-resolved electron diffraction revealing the nonthermal dynamics of near-UV photoexcitation-induced amorphization in Ge(2)Sb(2)Te(5) Hada, Masaki Oba, Wataru Kuwahara, Masashi Katayama, Ikufumi Saiki, Toshiharu Takeda, Jun Nakamura, Kazutaka G. Sci Rep Article Because of their robust switching capability, chalcogenide glass materials have been used for a wide range of applications, including optical storages devices. These phase transitions are achieved by laser irradiation via thermal processes. Recent studies have suggested the potential of nonthermal phase transitions in the chalcogenide glass material Ge(2)Sb(2)Te(5) triggered by ultrashort optical pulses; however, a detailed understanding of the amorphization and damage mechanisms governed by nonthermal processes is still lacking. Here we performed ultrafast time-resolved electron diffraction and single-shot optical pump-probe measurements followed by femtosecond near-ultraviolet pulse irradiation to study the structural dynamics of polycrystalline Ge(2)Sb(2)Te(5). The experimental results present a nonthermal crystal-to-amorphous phase transition of Ge(2)Sb(2)Te(5) initiated by the displacements of Ge atoms. Above the fluence threshold, we found that the permanent amorphization caused by multi-displacement effects is accompanied by a partial hexagonal crystallization. Nature Publishing Group 2015-08-28 /pmc/articles/PMC4551965/ /pubmed/26314613 http://dx.doi.org/10.1038/srep13530 Text en Copyright © 2015, Macmillan Publishers Limited http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
spellingShingle | Article Hada, Masaki Oba, Wataru Kuwahara, Masashi Katayama, Ikufumi Saiki, Toshiharu Takeda, Jun Nakamura, Kazutaka G. Ultrafast time-resolved electron diffraction revealing the nonthermal dynamics of near-UV photoexcitation-induced amorphization in Ge(2)Sb(2)Te(5) |
title | Ultrafast time-resolved electron diffraction revealing the nonthermal dynamics of near-UV photoexcitation-induced amorphization in Ge(2)Sb(2)Te(5) |
title_full | Ultrafast time-resolved electron diffraction revealing the nonthermal dynamics of near-UV photoexcitation-induced amorphization in Ge(2)Sb(2)Te(5) |
title_fullStr | Ultrafast time-resolved electron diffraction revealing the nonthermal dynamics of near-UV photoexcitation-induced amorphization in Ge(2)Sb(2)Te(5) |
title_full_unstemmed | Ultrafast time-resolved electron diffraction revealing the nonthermal dynamics of near-UV photoexcitation-induced amorphization in Ge(2)Sb(2)Te(5) |
title_short | Ultrafast time-resolved electron diffraction revealing the nonthermal dynamics of near-UV photoexcitation-induced amorphization in Ge(2)Sb(2)Te(5) |
title_sort | ultrafast time-resolved electron diffraction revealing the nonthermal dynamics of near-uv photoexcitation-induced amorphization in ge(2)sb(2)te(5) |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4551965/ https://www.ncbi.nlm.nih.gov/pubmed/26314613 http://dx.doi.org/10.1038/srep13530 |
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