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

Sokolovskaya, O.I.; Golovan, L.A.; Zabotnov, S.V.; Kashkarov, P.K.; Sergeeva, E.A.; Kirillin, M.Y.

Авторы: Sokolovskaya Olga I., Golovan Leonid A., Zabotnov Stnislav V., Kashkarov Pavel K., Sergeeva Ekaterina A., Kirillin Mikhail Y.
Сборник: Proceedings of SPIE (2022 год, Computational Biophysics and Nanobiophotonics)
Том: 12194
Год издания: 2022
Место издания: SPIE
Номер статьи: 121940T
DOI: 10.1117/12.2628022
Аннотация: 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.
Добавил в систему: Соколовская Ольга Игоревна

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