"Mechanism of Laser-Induced Formation of Metal Nanoparticles and Nanostructures: Molecular Dynamic Modeling" by Dmitry Ivanov

Seminar by Dmitry Ivanov, Kassel University, Technical University Kaiserslautern, Lebedev Physical Institute, and Moscow Engineering Physics

Abstract

In this work we investigate the mechanism of nanostructures and na-noparticles generation due to laser ablation of metals in liquid media with numerical atomistic-continuum model. The model is capable of addressing the mechanisms of non-equilibrium laser-induced phase transition processes at atomic level with Molecular Dynamics (MD) ap-proach, whereas the effect of free carriers, playing a determinant role during short laser pulse ablation phenomena, is described in continuum with Two Temperature Model (TTM). Such the combined MD-TTM model [1] was utilized in super large scale simulations of nanostructures and nanoparticles generation processes in vacuum and liquid medium. The obtained structures and nanoparticles are then analyzed and charac-terized from the point of their morphology and size distribution corre-spondingly, Figure 1. These characteristics were then studied as func-tions of the laser parameters (pulse duration and fluence), the irradiated materials (Al and Au), and surrounding media (air and water) [2]. The performed simulations enable the direct comparison of the modeling results and the experimental data [3] and allow for drawing a possibility of manipulation with the laser parameters and surrounding media for generation of the nanostructures and nanoparticles with predesigned properties.

[1] D.S. Ivanov, V.P. Lipp, A. Blumenstein, V.P. Veiko, E.B. Yakovlev, V.V. Roddatis, M.E. Garcia, B. Rethfeld, J. Ihlemann, and P. Simon, Phys. Rev. Appl. 4, 064006 (2015).

[2] M. Iqbal, S.A. Khan, D.S. Ivanov, R.A. Ganeev, V.V. Kim, G.S. Boltaev, N.A. Abbasi, S. Shaju, M.E. Garcia, B. Rethfeld and A.S. Alnaser, Appl Sur Sci 527, 146702 (2020).

[3] D.S. Ivanov, Th. Izgin, A.N. Mayorov, V.P. Veiko, B. Rethfeld, Y.I. Dombrovska, M.E. Garcia, I.N. Zavestovskaya, S.M. Klimentov, A.V. Kabashin, Molecules 25, 67 (2020).

This seminar will be held in english