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Symmetry
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Advances in Laser Produced Plasmas Research
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Advances in Laser Produced Plasmas Research

A special issue of Symmetry (ISSN 2073-8994). This special issue belongs to the section "Physics".

Deadline for manuscript submissions: closed (15 December 2019) | Viewed by 11088

Printed Edition Available!
A printed edition of this Special Issue is available here.

Special Issue Editors

Prof. Dr. Maricel Agop

E-Mail Website
Guest Editor
Department of Materials Science, Gheorghe Asachi Technical University of Iasi, 700050 Iasi, Romania
Interests: drug delivery; fractal physics; non-linear dynamics; theoretical non-differentiable physics; polymer dynamics
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Viorel-Puiu Paun

E-Mail Website
Guest Editor
Physics Department, Faculty of Applied Sciences, POLITEHNICA University of Bucharest, Romania; Corresponding Member of the Romanian Scientists Academy, Romania
Interests: physics; complex systems; computational physics; nonlinear dynamics
Special Issues, Collections and Topics in MDPI journals
Dr. Stefan-Andrei Irimiciuc

E-Mail Website
Guest Editor
National Institute for Laser, Plasma and Radiation Physics, 409 Atomistilor Street, 077125 Bucharest, Romania
Interests: fractal physics; laser–matter interaction; plasma diagnostics; drug delivery; polymer dynamics
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The world of laser–matter interactions has known great and rapid advancements in the last few years, with a considerable increase in the number of both experimental and theoretical studies.  The classical paradigm used to describe the dynamics of laser-produced plasmas has been challenged by new peculiar phenomena observed experimentally, such as plasma particles oscillations, plume splitting and chaotic and self-structuring behavior during the expansion of the ejected particles. The use of multiple complimentary techniques has become a requirement, as different aspects can be showcased by specific experimental approaches. To balance these non-linear effects and still remain tributary to the classical theoretical views on laser produced plasma dynamics novel theoretical models that cover the two sides of the ablation plasma (differentiability and non-differentiability) still need to be developed.

Plasma is a strongly nonlinear dynamic system, with many degrees of freedom and other symmetries, favorable for the development of ordered structures, instabilities and transitions (from ordered to chaotic states). In such context we want to showcase research based on global and local symmetries, complexity, invariance and conservation laws, etc.

This Special Issue aims to attract research focused on exciting new phenomena related to laser produced plasma dynamics with the implementation of theoretical models towards understanding the complex reality as it is showcased by experimental investigations.

Prof. Maricel Agop
Prof. Viorel-Puiu Paun
Dr. Stefan Andrei IRIMICIUC
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Symmetry is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Differentiability and non-differentiability procedures in laser produced plasmas dynamics analysis
  • Holographic approach in understanding transient laser produced plasma dynamics
  • Chaos and self-structuring during laser produced plasma plume expansion. Non-linear approach
  • Laser produced plasma particle oscillations
  • Particle separation during ablation plasma plume flow
  • Direct and hidden symmetries in laser produced plasmas
  • Theoretical modelling of transient plasmas generated by laser ablation
  • Fractal models in space charge complex structures and other symmetries of plasma

Published Papers (5 papers)

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Research

20 pages, 2817 KiB  
Article
Charged Particle Oscillations in Transient Plasmas Generated by Nanosecond Laser Ablation on Mg Target
by Maricel Agop, Ilarion Mihaila, Florin Nedeff and Stefan Andrei Irimiciuc
Symmetry 2020, 12(2), 292; https://doi.org/10.3390/sym12020292 - 17 Feb 2020
Cited by 9 | Viewed by 1910
Abstract
The dynamics of a transient plasma generated by laser ablation on a Mg target was investigated by means of the Langmuir probe method and fractal analysis. The empirical data showcased the presence of an oscillatory behavior at short expansion times (<1 μs) characterized [...] Read more.
The dynamics of a transient plasma generated by laser ablation on a Mg target was investigated by means of the Langmuir probe method and fractal analysis. The empirical data showcased the presence of an oscillatory behavior at short expansion times (<1 μs) characterized by two oscillation frequencies and a classical behavior for longer evolution times. Space- and time-resolved analysis was implemented in order to determine main plasma parameters like the electron temperature, plasma potential, or charged particle density. In the motion fractal paradigm, a theoretical model was built for the description of laser-produced plasma dynamics expressed through fractal-type equations. The calibration of such dynamics was performed through a fractal-type tunneling effect for physical systems with spontaneous symmetry breaking. This allows both the self-structuring of laser-produced plasma in two structures based on its separation on different oscillation modes and the determination of some characteristics involved in the self-structuring process. The mutual conditionings between the two structures are given as joint invariant functions on the action of two isomorph groups of SL(2R) type through the Stoler-type transformation, explicitly given through amplitude self-modulation. Full article
(This article belongs to the Special Issue Advances in Laser Produced Plasmas Research)
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15 pages, 6303 KiB  
Article
Investigations of Transient Plasma Generated by Laser Ablation of Hydroxyapatite during the Pulsed Laser Deposition Process
by Maricel Agop, Nicanor Cimpoesu, Silviu Gurlui and Stefan Andrei Irimiciuc
Symmetry 2020, 12(1), 132; https://doi.org/10.3390/sym12010132 - 09 Jan 2020
Cited by 5 | Viewed by 1973
Abstract
The optimization of the pulsed laser deposition process was attempted here for the generation of hydroxyapatite thin films. The deposition process was monitored with an ICCD (Intensified Coupled Charged Device) fast gated camera and a high-resolution spectrometer. The global dynamics of the laser [...] Read more.
The optimization of the pulsed laser deposition process was attempted here for the generation of hydroxyapatite thin films. The deposition process was monitored with an ICCD (Intensified Coupled Charged Device) fast gated camera and a high-resolution spectrometer. The global dynamics of the laser produced plasma showed a self-structuring into three components with different composition and kinetics. The optical emission spectroscopy revealed the formation of a stoichiometric plasma and proved that the segregation in the kinetic energy of the plasma structure is also reflected by the individual energies of the ejected particles. Atomic Force Microscopy was also implemented to investigate the properties and the quality of the deposited film. The presence of micrometric clusters was seen at a high laser fluence deposition with in-situ ICCD imaging. We developed a fractal model based on Schrödinger type functionalities. The model can cover the distribution of the excited states in the laser produced plasma. Moreover, we proved that SL(2R) invariance can facilitate plasma substructures synchronization through a self-modulation in amplitude. Full article
(This article belongs to the Special Issue Advances in Laser Produced Plasmas Research)
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19 pages, 4916 KiB  
Article
In-Situ Plasma Monitoring during the Pulsed Laser Deposition of Ni60Ti40 Thin Films
by Nicanor Cimpoesu, Silviu Gurlui, Georgiana Bulai, Ramona Cimpoesu, Viorel-Puiu Paun, Stefan Andrei Irimiciuc and Maricel Agop
Symmetry 2020, 12(1), 109; https://doi.org/10.3390/sym12010109 - 06 Jan 2020
Cited by 4 | Viewed by 2226
Abstract
The properties of pulsed laser deposited of Ni60Ti40 shape memory thin films generated in various deposition conditions were investigated. In-situ plasma monitoring was implemented by means of space- and time-resolved optical emission spectroscopy, and ICCD fast camera imaging. Structural and [...] Read more.
The properties of pulsed laser deposited of Ni60Ti40 shape memory thin films generated in various deposition conditions were investigated. In-situ plasma monitoring was implemented by means of space- and time-resolved optical emission spectroscopy, and ICCD fast camera imaging. Structural and chemical analyses were performed on the thin films using SEM, AFM, EDS, and XRD equipment. The deposition parameters influence on the chemical composition of the thin films was investigated. The peeled layer presented on DSC a solid-state transformation in a different transformation domain compared to the target properties. A fractal model was used to describe the dynamics of laser produced plasma through various non-differentiable functionalities. Through hydrodynamic type regimes, space-time homographic transformations were correlated with the global dynamics of the ablation plasmas. Spatial simultaneity of homographic transformation through a special SL(2R) invariance implies the description of plasma dynamics through Riccati type equations, establishing correlations with the optical emission spectroscopy measurements. Full article
(This article belongs to the Special Issue Advances in Laser Produced Plasmas Research)
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22 pages, 4186 KiB  
Article
Investigations of Laser Produced Plasmas Generated by Laser Ablation on Geomaterials. Experimental and Theoretical Aspects
by Florin Enescu, Stefan Andrei Irimiciuc, Nicanor Cimpoesu, Horea Bedelean, Georgiana Bulai, Silviu Gurlui and Maricel Agop
Symmetry 2019, 11(11), 1391; https://doi.org/10.3390/sym11111391 - 09 Nov 2019
Cited by 8 | Viewed by 2024
Abstract
Several surface investigation techniques, such as X-ray diffraction (XRD), EDX, and optical microscopy, were employed in order to describe the mineral contents in several geomaterials. Space and time resolved optical emission spectroscopy was implemented to analyze the plasma generated by the laser–geomaterial interaction. [...] Read more.
Several surface investigation techniques, such as X-ray diffraction (XRD), EDX, and optical microscopy, were employed in order to describe the mineral contents in several geomaterials. Space and time resolved optical emission spectroscopy was implemented to analyze the plasma generated by the laser–geomaterial interaction. The values of the plasma parameters (velocity and temperature) were discussed with respect to the nature of the minerals composing the geomaterials and the morphological structure of the samples. Correlations were found between the excitation temperatures of the atomic and ionic species of the plasmas and the presence of calcite in the samples. A mathematical model was built to describe the dynamics in ablation plasma using various mathematical operational procedures: multi structuring of the ablation plasma by means of the fractal analysis and synchronizations of the ablation plasma entities through SL (2R) type group invariance and in a particular case, through self-modulation in the form of Stoler type transformations. Since Stoler type transformations are implied in general, in the charge creation and annihilation processes, then the SL (2R) type group invariance become fundamental in the description of ablation plasma dynamics. Full article
(This article belongs to the Special Issue Advances in Laser Produced Plasmas Research)
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13 pages, 2190 KiB  
Article
Lorenz Type Behaviors in the Dynamics of Laser Produced Plasma
by Stefan Andrei Irimiciuc, Florin Enescu, Andrei Agop and Maricel Agop
Symmetry 2019, 11(9), 1135; https://doi.org/10.3390/sym11091135 - 06 Sep 2019
Cited by 4 | Viewed by 2157
Abstract
An innovative theoretical model is developed on the backbone of a classical Lorenz system. A mathematical representation of a differential Lorenz system is transposed into a fractal space and reduced to an integral form. In such a conjecture, the Lorenz variables will operate [...] Read more.
An innovative theoretical model is developed on the backbone of a classical Lorenz system. A mathematical representation of a differential Lorenz system is transposed into a fractal space and reduced to an integral form. In such a conjecture, the Lorenz variables will operate simultaneously on two manifolds, generating two transformation groups, one corresponding to the space coordinates transformation and another one to the scale resolution transformation. Since these groups are isomorphs various types isometries become functional. The Lorenz system was further adapted to describe the dynamics of ejected particles as a result of laser matter interaction in a fractal paradigm. The simulations were focused on the dynamics of charged particles, and showcase the presence of current oscillations, a heterogenous velocity distribution and multi-structuring at different interaction scales. The theoretical predictions were compared with the experimental data acquired with noninvasive diagnostic techniques. The experimental data confirm the multi-structure scenario and the oscillatory behavior predicted by the mathematical model. Full article
(This article belongs to the Special Issue Advances in Laser Produced Plasmas Research)
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