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Solitary Nanostructures Produced by Ultrashort Laser Pulse

Laser-produced surface nanostructures show considerable promise for many applications while fundamental questions concerning the corresponding mechanisms of structuring are still debated. Here, we present a simple physical model describing those mechanisms happened in a thin metal film on dielectric...

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Autores principales: Inogamov, Nail A., Zhakhovsky, Vasily V., Khokhlov, Viktor A., Petrov, Yury V., Migdal, Kirill P.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer US 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4820416/
https://www.ncbi.nlm.nih.gov/pubmed/27044306
http://dx.doi.org/10.1186/s11671-016-1381-1
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author Inogamov, Nail A.
Zhakhovsky, Vasily V.
Khokhlov, Viktor A.
Petrov, Yury V.
Migdal, Kirill P.
author_facet Inogamov, Nail A.
Zhakhovsky, Vasily V.
Khokhlov, Viktor A.
Petrov, Yury V.
Migdal, Kirill P.
author_sort Inogamov, Nail A.
collection PubMed
description Laser-produced surface nanostructures show considerable promise for many applications while fundamental questions concerning the corresponding mechanisms of structuring are still debated. Here, we present a simple physical model describing those mechanisms happened in a thin metal film on dielectric substrate irradiated by a tightly focused ultrashort laser pulse. The main ingredients included into the model are (i) the film–substrate hydrodynamic interaction, melting and separation of the film from substrate with velocity increasing with increase of absorbed fluence; (ii) the capillary forces decelerating expansion of the expanding flying film; and (iii) rapid freezing into a solid state if the rate of solidification is comparable or larger than hydrodynamic velocities. The developed model and performed simulations explain appearance of microbump inside the focal spot on the film surface. The model follows experimental findings about gradual transformation of the bump from small parabolic to a conical shape and to the bump with a jet on its tip with increasing fluence. Disruption of the bump as a result of thinning down the liquid film to a few interatomic distances or due to mechanical break-off of solid film is described together with the jetting and formation of one or many droplets. Developed theory opens door for optimizing laser parameters for intended nanostructuring in applications.
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spelling pubmed-48204162016-04-11 Solitary Nanostructures Produced by Ultrashort Laser Pulse Inogamov, Nail A. Zhakhovsky, Vasily V. Khokhlov, Viktor A. Petrov, Yury V. Migdal, Kirill P. Nanoscale Res Lett Nano Express Laser-produced surface nanostructures show considerable promise for many applications while fundamental questions concerning the corresponding mechanisms of structuring are still debated. Here, we present a simple physical model describing those mechanisms happened in a thin metal film on dielectric substrate irradiated by a tightly focused ultrashort laser pulse. The main ingredients included into the model are (i) the film–substrate hydrodynamic interaction, melting and separation of the film from substrate with velocity increasing with increase of absorbed fluence; (ii) the capillary forces decelerating expansion of the expanding flying film; and (iii) rapid freezing into a solid state if the rate of solidification is comparable or larger than hydrodynamic velocities. The developed model and performed simulations explain appearance of microbump inside the focal spot on the film surface. The model follows experimental findings about gradual transformation of the bump from small parabolic to a conical shape and to the bump with a jet on its tip with increasing fluence. Disruption of the bump as a result of thinning down the liquid film to a few interatomic distances or due to mechanical break-off of solid film is described together with the jetting and formation of one or many droplets. Developed theory opens door for optimizing laser parameters for intended nanostructuring in applications. Springer US 2016-04-05 /pmc/articles/PMC4820416/ /pubmed/27044306 http://dx.doi.org/10.1186/s11671-016-1381-1 Text en © Inogamov et al. 2016 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
spellingShingle Nano Express
Inogamov, Nail A.
Zhakhovsky, Vasily V.
Khokhlov, Viktor A.
Petrov, Yury V.
Migdal, Kirill P.
Solitary Nanostructures Produced by Ultrashort Laser Pulse
title Solitary Nanostructures Produced by Ultrashort Laser Pulse
title_full Solitary Nanostructures Produced by Ultrashort Laser Pulse
title_fullStr Solitary Nanostructures Produced by Ultrashort Laser Pulse
title_full_unstemmed Solitary Nanostructures Produced by Ultrashort Laser Pulse
title_short Solitary Nanostructures Produced by Ultrashort Laser Pulse
title_sort solitary nanostructures produced by ultrashort laser pulse
topic Nano Express
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4820416/
https://www.ncbi.nlm.nih.gov/pubmed/27044306
http://dx.doi.org/10.1186/s11671-016-1381-1
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