Numerical simulation of picosecond laser fragmentation of silicon micropowder in the framework of photothermal mechanism

Olga I. Sokolovskaya; Leonid A. Golovan; Stanislav V. Zabotnov; Pavel K. Kashkarov; Ekaterina A. Sergeeva; Mikhail Yu. Kirillin

doi:10.1117/12.2628022

29 April 2022 Numerical simulation of picosecond laser fragmentation of silicon micropowder in the framework of photothermal mechanism

Olga I. Sokolovskaya, Leonid A. Golovan, Stanislav V. Zabotnov, Pavel K. Kashkarov, Ekaterina A. Sergeeva, Mikhail Yu. Kirillin

Author Affiliations +

Proceedings Volume 12194, Computational Biophysics and Nanobiophotonics; 121940T (2022) https://doi.org/10.1117/12.2628022
Event: XXV Annual Conference Saratov Fall Meeting 2021; and IX Symposium on Optics and Biophotonics, 2021, Saratov, Russian Federation

Abstract

The efficiency of silicon nanoparticles (SiNPs) formation via picosecond laser fragmentation of silicon micropowder in water suspension was analyzed. We carried out numerical simulations of propagation of a single focused laser pulse with energy of 16 mJ in suspensions of silicon microparticles (SiMPs) with diameter of 5 μm accounting for temperaturedependent thermal and optical properties of the media under study. The simulations were performed for SiMP mass concentrations varied from 0.5 to 12 mg/mL and irradiation wavelengths of 1064 and 532 nm. To estimate the efficiency of the fragmentation process we calculated the mass of the silicon melted by the laser pulse. The fragmentation process as well as mass of silicon undergone phase transitions were demonstrated to depend significantly on SiMPs mass concentration and wavelength of the laser radiation. For irradiation at 1064 nm the mass of melted silicon varies nonmonotonically with increase of SiMPs mass concentration decreasing to minimum at 5 mg/mL and increasing an order of magnitude with a further increase in SiMPs mass concentration. When using radiation at a wavelength of 532 nm, the mass of melted silicon increases up to two orders of magnitude in comparison with the case of 1064 nm, while the mass of melted silicon rose with increase of the SIMP concentration.

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Olga I. Sokolovskaya, Leonid A. Golovan, Stanislav V. Zabotnov, Pavel K. Kashkarov, Ekaterina A. Sergeeva, and Mikhail Yu. Kirillin "Numerical simulation of picosecond laser fragmentation of silicon micropowder in the framework of photothermal mechanism", Proc. SPIE 12194, Computational Biophysics and Nanobiophotonics, 121940T (29 April 2022); https://doi.org/10.1117/12.2628022

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KEYWORDS

Silicon

Absorption

Semiconductor lasers

Pulsed laser operation

Picosecond phenomena

Scattering

Water

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