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Title: Mechanism of single-pulse ablative generation of laser-induced periodic surface structures

Abstract

One of the remarkable capabilities of ultrashort polarized laser pulses is the generation of laser-induced periodic surface structures (LIPSS). The origin of this phenomenon is largely attributed to the interference of the incident laser wave and surface electromagnetic wave that creates a periodic absorption pattern. Although, commonly, LIPSS are produced by repetitive irradiation of the same area by multiple laser pulses in the regime of surface melting and resolidification, recent reports demonstrate the formation of LIPSS in the single-pulse irradiation regime at laser fluences well above the ablation threshold. In this paper, we report results of a large-scale molecular dynamics simulation aimed at providing insights into the mechanisms of single-pulse ablative LIPSS formation. The simulation performed for a Cr target reveals an interplay of material removal and redistribution in the course of spatially modulated ablation, leading to the transient formation of an elongated liquid wall extending up to ∼600 nm above the surface of the target at the locations of the minima of the laser energy deposition. The upper part of the liquid wall disintegrates into droplets while the base of the wall solidifies on the time scale of ∼2 ns, producing a ∼100-nm-tall frozen surface feature extending above themore » level of the initial surface of the target. The properties of the surface region of the target are modified by the presence of high densities of dislocations and vacancies generated due to the rapid and highly nonequilibrium nature of the melting and resolidification processes. The insights into the LIPSS formation mechanisms may help in designing approaches for increasing the processing speed and improving the quality of the laser-patterned periodic surface structures.« less

Authors:
 [1];  [2];  [3];  [1]
  1. Univ. of Virginia, Charlottesville, VA (United States). Dept. of Materials Science and Engineering
  2. University of Modena and Reggio Emilia (UNIMORE), Reggio Emilia (Italy). DISMI
  3. Inst. of Physics of the Czech Academy of Sciences, Dolní Bˇrežany (Czech Republic). HiLASE Centre; S.S. Kutateladze Inst. of Thermophysics SF RAS, Novosibirsk (Russia)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1565689
Resource Type:
Journal Article
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 96; Journal Issue: 20; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
Materials Science; Physics

Citation Formats

Shugaev, Maxim V., Gnilitskyi, Iaroslav, Bulgakova, Nadezhda M., and Zhigilei, Leonid V. Mechanism of single-pulse ablative generation of laser-induced periodic surface structures. United States: N. p., 2017. Web. doi:10.1103/physrevb.96.205429.
Shugaev, Maxim V., Gnilitskyi, Iaroslav, Bulgakova, Nadezhda M., & Zhigilei, Leonid V. Mechanism of single-pulse ablative generation of laser-induced periodic surface structures. United States. doi:10.1103/physrevb.96.205429.
Shugaev, Maxim V., Gnilitskyi, Iaroslav, Bulgakova, Nadezhda M., and Zhigilei, Leonid V. Wed . "Mechanism of single-pulse ablative generation of laser-induced periodic surface structures". United States. doi:10.1103/physrevb.96.205429.
@article{osti_1565689,
title = {Mechanism of single-pulse ablative generation of laser-induced periodic surface structures},
author = {Shugaev, Maxim V. and Gnilitskyi, Iaroslav and Bulgakova, Nadezhda M. and Zhigilei, Leonid V.},
abstractNote = {One of the remarkable capabilities of ultrashort polarized laser pulses is the generation of laser-induced periodic surface structures (LIPSS). The origin of this phenomenon is largely attributed to the interference of the incident laser wave and surface electromagnetic wave that creates a periodic absorption pattern. Although, commonly, LIPSS are produced by repetitive irradiation of the same area by multiple laser pulses in the regime of surface melting and resolidification, recent reports demonstrate the formation of LIPSS in the single-pulse irradiation regime at laser fluences well above the ablation threshold. In this paper, we report results of a large-scale molecular dynamics simulation aimed at providing insights into the mechanisms of single-pulse ablative LIPSS formation. The simulation performed for a Cr target reveals an interplay of material removal and redistribution in the course of spatially modulated ablation, leading to the transient formation of an elongated liquid wall extending up to ∼600 nm above the surface of the target at the locations of the minima of the laser energy deposition. The upper part of the liquid wall disintegrates into droplets while the base of the wall solidifies on the time scale of ∼2 ns, producing a ∼100-nm-tall frozen surface feature extending above the level of the initial surface of the target. The properties of the surface region of the target are modified by the presence of high densities of dislocations and vacancies generated due to the rapid and highly nonequilibrium nature of the melting and resolidification processes. The insights into the LIPSS formation mechanisms may help in designing approaches for increasing the processing speed and improving the quality of the laser-patterned periodic surface structures.},
doi = {10.1103/physrevb.96.205429},
journal = {Physical Review B},
issn = {2469-9950},
number = 20,
volume = 96,
place = {United States},
year = {2017},
month = {11}
}

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