Surface morphology and phase transformations of femtosecond laser-processed saphire
Autor(a) principal: | |
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Data de Publicação: | 2014 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10400.21/4990 |
Resumo: | The morphological and structural modifications induced in sapphire by surface treatment with femtosecond laser radiation were studied. Single-crystal sapphire wafers cut parallel to the (0 1 2) planes were treated with 560 fs, 1030 nm wavelength laser radiation using wide ranges of pulse energy and repetition rate. Self-ordered periodic structures with an average spatial periodicity of similar to 300 nm were observed for fluences slightly higher than the ablation threshold. For higher fluences the interaction was more disruptive and extensive fracture, exfoliation, and ejection of ablation debris occurred. Four types of particles were found in the ablation debris: (a) spherical nanoparticles about 50 nm in diameter; (b) composite particles between 150 and 400 nm in size; (c) rounded resolidified particles about 100-500 nm in size; and (d) angular particles presenting a lamellar structure and deformation twins. The study of those particles by selected area electron diffraction showed that the spherical nanoparticles and the composite particles are amorphous, while the resolidified droplets and the angular particles, present a crystalline a-alumina structure, the same of the original material. Taking into consideration the existing ablation theories, it is proposed that the spherical nanoparticles are directly emitted from the surface in the ablation plume, while resolidified droplets are emitted as a result of the ablation process, in the liquid phase, in the low intensity regime, and by exfoliation, in the high intensity regime. Nanoparticle clusters are formed by nanoparticle coalescence in the cooling ablation plume. (C) 2013 Elsevier B.V. All rights reserved. |
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Surface morphology and phase transformations of femtosecond laser-processed saphireSapphireFemtosecond Laser AblationSelf-Ordered Periodic StructuresAblation DebrisThe morphological and structural modifications induced in sapphire by surface treatment with femtosecond laser radiation were studied. Single-crystal sapphire wafers cut parallel to the (0 1 2) planes were treated with 560 fs, 1030 nm wavelength laser radiation using wide ranges of pulse energy and repetition rate. Self-ordered periodic structures with an average spatial periodicity of similar to 300 nm were observed for fluences slightly higher than the ablation threshold. For higher fluences the interaction was more disruptive and extensive fracture, exfoliation, and ejection of ablation debris occurred. Four types of particles were found in the ablation debris: (a) spherical nanoparticles about 50 nm in diameter; (b) composite particles between 150 and 400 nm in size; (c) rounded resolidified particles about 100-500 nm in size; and (d) angular particles presenting a lamellar structure and deformation twins. The study of those particles by selected area electron diffraction showed that the spherical nanoparticles and the composite particles are amorphous, while the resolidified droplets and the angular particles, present a crystalline a-alumina structure, the same of the original material. Taking into consideration the existing ablation theories, it is proposed that the spherical nanoparticles are directly emitted from the surface in the ablation plume, while resolidified droplets are emitted as a result of the ablation process, in the liquid phase, in the low intensity regime, and by exfoliation, in the high intensity regime. Nanoparticle clusters are formed by nanoparticle coalescence in the cooling ablation plume. (C) 2013 Elsevier B.V. All rights reserved.Elsevier Science BVRCIPLVilar, R.Sharma, S. P.Almeida, A.Cangueiro, L. T.Oliveira, Vitor2015-08-25T11:06:45Z2014-012014-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.21/4990engVILAR, R., SHARMA, S. P.; ALMEIDA, A.; CANGUEIRO, L. T.; OLIVEIRA, Victor Manuel Barbas – Surface morphology and phase transformations of femtosecond laser-processed saphire. Applied Surface Science. ISSN: 0169-4332. Vol. 288 (2014), pp. 313-3230169-433210.1016/j.apsusc.2013.10.026metadata only accessinfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-08-03T09:47:47ZPortal AgregadorONG |
dc.title.none.fl_str_mv |
Surface morphology and phase transformations of femtosecond laser-processed saphire |
title |
Surface morphology and phase transformations of femtosecond laser-processed saphire |
spellingShingle |
Surface morphology and phase transformations of femtosecond laser-processed saphire Vilar, R. Sapphire Femtosecond Laser Ablation Self-Ordered Periodic Structures Ablation Debris |
title_short |
Surface morphology and phase transformations of femtosecond laser-processed saphire |
title_full |
Surface morphology and phase transformations of femtosecond laser-processed saphire |
title_fullStr |
Surface morphology and phase transformations of femtosecond laser-processed saphire |
title_full_unstemmed |
Surface morphology and phase transformations of femtosecond laser-processed saphire |
title_sort |
Surface morphology and phase transformations of femtosecond laser-processed saphire |
author |
Vilar, R. |
author_facet |
Vilar, R. Sharma, S. P. Almeida, A. Cangueiro, L. T. Oliveira, Vitor |
author_role |
author |
author2 |
Sharma, S. P. Almeida, A. Cangueiro, L. T. Oliveira, Vitor |
author2_role |
author author author author |
dc.contributor.none.fl_str_mv |
RCIPL |
dc.contributor.author.fl_str_mv |
Vilar, R. Sharma, S. P. Almeida, A. Cangueiro, L. T. Oliveira, Vitor |
dc.subject.por.fl_str_mv |
Sapphire Femtosecond Laser Ablation Self-Ordered Periodic Structures Ablation Debris |
topic |
Sapphire Femtosecond Laser Ablation Self-Ordered Periodic Structures Ablation Debris |
description |
The morphological and structural modifications induced in sapphire by surface treatment with femtosecond laser radiation were studied. Single-crystal sapphire wafers cut parallel to the (0 1 2) planes were treated with 560 fs, 1030 nm wavelength laser radiation using wide ranges of pulse energy and repetition rate. Self-ordered periodic structures with an average spatial periodicity of similar to 300 nm were observed for fluences slightly higher than the ablation threshold. For higher fluences the interaction was more disruptive and extensive fracture, exfoliation, and ejection of ablation debris occurred. Four types of particles were found in the ablation debris: (a) spherical nanoparticles about 50 nm in diameter; (b) composite particles between 150 and 400 nm in size; (c) rounded resolidified particles about 100-500 nm in size; and (d) angular particles presenting a lamellar structure and deformation twins. The study of those particles by selected area electron diffraction showed that the spherical nanoparticles and the composite particles are amorphous, while the resolidified droplets and the angular particles, present a crystalline a-alumina structure, the same of the original material. Taking into consideration the existing ablation theories, it is proposed that the spherical nanoparticles are directly emitted from the surface in the ablation plume, while resolidified droplets are emitted as a result of the ablation process, in the liquid phase, in the low intensity regime, and by exfoliation, in the high intensity regime. Nanoparticle clusters are formed by nanoparticle coalescence in the cooling ablation plume. (C) 2013 Elsevier B.V. All rights reserved. |
publishDate |
2014 |
dc.date.none.fl_str_mv |
2014-01 2014-01-01T00:00:00Z 2015-08-25T11:06:45Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10400.21/4990 |
url |
http://hdl.handle.net/10400.21/4990 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
VILAR, R., SHARMA, S. P.; ALMEIDA, A.; CANGUEIRO, L. T.; OLIVEIRA, Victor Manuel Barbas – Surface morphology and phase transformations of femtosecond laser-processed saphire. Applied Surface Science. ISSN: 0169-4332. Vol. 288 (2014), pp. 313-323 0169-4332 10.1016/j.apsusc.2013.10.026 |
dc.rights.driver.fl_str_mv |
metadata only access info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
metadata only access |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Elsevier Science BV |
publisher.none.fl_str_mv |
Elsevier Science BV |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
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repository.mail.fl_str_mv |
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1777304515388637184 |