Temperature dependence of the loss coefficients during the formation of surface laser-stimulated nanostructures
| Autor: | A. D. Suprun, S. M. Yezhov, L. V. Shmeleva, V. V. Datsyuk |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Scattering Materials Science (miscellaneous) 02 engineering and technology Cell Biology 010402 general chemistry 021001 nanoscience & nanotechnology Surface pressure Laser 01 natural sciences Molecular physics Atomic and Molecular Physics and Optics 0104 chemical sciences law.invention law Phase (matter) Thermal Surface roughness Electrical and Electronic Engineering Physical and Theoretical Chemistry Reflection coefficient 0210 nano-technology Biotechnology Dimensionless quantity |
| Zdroj: | Applied Nanoscience. 12:701-709 |
| ISSN: | 2190-5517 2190-5509 |
| Popis: | Numerical simulation of the formation of nanocraters on a solid surface during powerful laser processing was performed. System of two interconnected differential equations for the dynamics of the crater form and surface pressure underlies the problem under consideration. This system describes a process of high precision laser processing without the formation of a melt. It contains parameters, which are the optical and thermal loss coefficients for the initial flow when it reaches the interface. The coefficients of optical and heat losses at the interface between the solid and plasma-gas phases make it possible to divide the consideration of the problem into two independent problems in each of the phases. It was found that the sum of these coefficients is, with good accuracy, equal to one. This made it possible to focus only on optical loss. Generally optical losses represent as the sum of the reflection coefficient and the dimensionless scattering factor. The dependences of the reflection coefficient and scattering factor on temperature, radius of surface roughness and pressure in the plasma-gas phase are found. |
| Databáze: | OpenAIRE |
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