Por favor, use este identificador para citar o enlazar a este item:
http://hdl.handle.net/10261/218114
COMPARTIR / EXPORTAR:
SHARE CORE BASE | |
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE | |
Título: | Generation, control and erasure of dual LIPSS in germanium with fs and ns laser pulses |
Autor: | Casquero, Noemí CSIC ORCID; Fuentes-Edfuf, Yasser CSIC ORCID; Zazo, Raúl CSIC; Solís Céspedes, Javier CSIC ORCID ; Siegel, Jan CSIC ORCID | Palabras clave: | LIPSS Femtosecond laser Nanosecond laser Ripples HSFL LSFL |
Fecha de publicación: | 17-ago-2020 | Editor: | Institute of Physics Publishing | Citación: | Journal of Physics D - Applied Physics, -125354.R1 (2020) | Resumen: | Laser-induced periodic surface structures (LIPSS) can readily be fabricated in virtually all types of materials and benefit from an efficient parallel patterning strategy that exploits self-organization. The wide range of different LIPSS types with different spatial scales and symmetries is continuously growing, addressing numerous of applications. Here, we report on the formation of two fundamentally different types of LIPSS on germanium upon exposure to femtosecond laser pulses (λ=800 nm, 130 fs), featuring different periods and orthogonal orientations. On the one hand, the well-known low-spatial frequency LIPSS (LSFL) with a period ≈λ and perpendicular orientation to the laser polarization are formed, which can be extended homogeneously in 2D by sample scanning. Additionally, extremely smooth ripples with a period ≈λ /2 and parallel orientation were generated at lower pulse numbers. We show that this new kind of ripples, named HSFL-∥, can be superimposed onto LSFL by increasing the pulse number, forming complex dual LIPSS with nanohill-like morphology. While exposure to multiple nanosecond laser pulses is found to trigger also the formation of LSFL, HSFL-∥ cannot be formed under these conditions, which points out the role of ultrafast excitation in the formation of the latter. By performing time-resolved reflectivity measurements, we are able to resolve the melting and solidification dynamics, revealing melting of a very shallow surface layer (< 20 nm) and melt durations of a few ns for both pulse durations pulses at the fluences employed for LIPSS formation. Finally, we demonstrate erasure of both types of LIPSS by exposure to single nanosecond pulses at high fluences, which paves the way for erasable multi-level data storage.Laser-induced periodic surface structures (LIPSS) can readily be fabricated in virtually all types of materials and benefit from an efficient parallel patterning strategy that exploits self-organization. The wide range of different LIPSS types with different spatial scales and symmetries is continuously growing, addressing numerous of applications. Here, we report on the formation of two fundamentally different types of LIPSS on germanium upon exposure to femtosecond laser pulses (λ=800 nm, 130 fs), featuring different periods and orthogonal orientations. On the one hand, the well-known low-spatial frequency LIPSS (LSFL) with a period ≈λ and perpendicular orientation to the laser polarization are formed, which can be extended homogeneously in 2D by sample scanning. Additionally, extremely smooth ripples with a period ≈λ /2 and parallel orientation were generated at lower pulse numbers. We show that this new kind of ripples, named HSFL-∥, can be superimposed onto LSFL by increasing the pulse number, forming complex dual LIPSS with nanohill-like morphology. While exposure to multiple nanosecond laser pulses is found to trigger also the formation of LSFL, HSFL-∥ cannot be formed under these conditions, which points out the role of ultrafast excitation in the formation of the latter. By performing time-resolved reflectivity measurements, we are able to resolve the melting and solidification dynamics, revealing melting of a very shallow surface layer (< 20 nm) and melt durations of a few ns for both pulse durations pulses at the fluences employed for LIPSS formation. Finally, we demonstrate erasure of both types of LIPSS by exposure to single nanosecond pulses at high fluences, which paves the way for erasable multi-level data storage. | Descripción: | 15 pags., 6 figs., | Versión del editor: | https://doi.org/10.1088/1361-6463/abafdf | URI: | http://hdl.handle.net/10261/218114 | DOI: | 10.1088/1361-6463/abafdf | ISSN: | 0022-3727 | E-ISSN: | 1361-6463 |
Aparece en las colecciones: | (CFMAC-IO) Artículos |
Ficheros en este ítem:
Fichero | Descripción | Tamaño | Formato | |
---|---|---|---|---|
Casquero_Germanium_JAP_DEF.pdf | Copia de autor | 1,42 MB | Adobe PDF | Visualizar/Abrir |
CORE Recommender
SCOPUSTM
Citations
12
checked on 29-mar-2024
WEB OF SCIENCETM
Citations
10
checked on 27-feb-2024
Page view(s)
164
checked on 29-mar-2024
Download(s)
277
checked on 29-mar-2024
Google ScholarTM
Check
Altmetric
Altmetric
Este item está licenciado bajo una Licencia Creative Commons