Abstract
The pulsed laser deposition process is a complex one, encompassing a wide range of physical phenomena that act at different time scales, ranging from laser absorption to melting, plasma formation, and thin film deposition. In the past 15 years, there has been an exponential increase in theoretical models for different aspects of laser ablation phenomena, especially laser-produced plasmas. Among these. new types of models based on multifractal physics have been proposed. The models aim to describe the various dynamics reported for laser-produced plasmas in both the multifractal-type Schrodinger representation and in the multifractal-type hydrodynamic representation. The two approaches are complementary, as the Schrodinger representation uses operation procedures (invariance groups, variational principles, harmonic maps, etc.) while the hydrodynamic representation translates the dynamics of the laser-produced plasma into fluid motion of a multifractal type. The aim of this review is to report on the wide range of dynamics that can be discussed within the framework of a multifractal approach to plasma dynamics.
Highlights
The development of theoretical models in a multifractal paradigm for the analysis of the intricate dynamics of complex physical systems has been reported in recent years as providing some important results related to multiparticle flow in fluids [1,2] or the dynamics of transient plasmas generated by laser ablation dynamics [3,4,5,6,7,8]
The analysis developed in [1,2,3,4,5,6] is based on projecting the dynamics of the laser-produced plasma (LPP) in a multifractal space defined by a selected number of variables that reflect the experimental reality
This approach to the investigation of LPP dynamics indicates the construction of new geometric structures [9,10], with physical theories tailored for these structures
Summary
The development of theoretical models in a multifractal paradigm for the analysis of the intricate dynamics of complex physical systems has been reported in recent years as providing some important results related to multiparticle flow in fluids [1,2] or the dynamics of transient plasmas generated by laser ablation dynamics [3,4,5,6,7,8]. The interactions between the plasma structural components (electrons, ions, clusters, molecules, atoms, and photons) govern micro–macro, local–global, individual–group, etc., reciprocal conditioning In such a paradigm, the global nature of the laws describing the dynamics of transient plasmas must be implicitly or explicitly reflected by the mathematical procedures of the multifractal model. In the multifractal paradigm, the physical variables describing the LLP dynamics act as a limit of a function family whose members are non-differentiable for a null scale resolution and differentiable for a non-null scale resolution This approach to the investigation of LPP dynamics indicates the construction of new geometric structures [9,10], with physical theories tailored for these structures. The aim of the review is to report on the wide range of dynamics that can be discussed within the framework of a multifractal view of plasma dynamics
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