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4Evolution from high-spatial-frequency laser-induced periodic surface structures to laser-induced periodic surface structures on surface of Ti and stainless steel target by sub-nanosecond laser
ablation in air
D.A. Antipov1*, E.V. Barmina1, I.O. Bruslavskiy1'2
1- Prokhorov General Physics Institute of the Russian Academy of Sciences, Vavilova str. 38, 119991 Moscow,
Russia
2- National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), 31, Kashirskoye
highway, 115409 Moscow, Russia
In this presentation, we introduce the latest research on the creation of laser-induced periodic surface structures (LSPL) and high-spatial-frequency laser-induced periodic surface structures (HSFL) on solid surfaces by their sub-nanosecond laser ablation in air. The laser formation of periodic nanostructures (NS) model is based on the theory of wave processes in materials. We found that thermocapillary instability in the melted layer on the surface leads to HSFL synthesis. Accompanying formation of self-organized NS on HSFL and LSFL is studied in relation to laser parameters and target material [1,2]. This report showcases the transformation of surface morphology from HSFL to LSFL formed through laser ablation in air varying laser parameters. In our experiments we used two types of lasers. The first was Nd:YAG laser with wavelength of 1064 nm, pulse duration of 30 ps and repetition rate of 1 kHz. The second laser beam was Yb:fiber fs-laser with wavelength of 1030 nm, pulse duration of 6 ps and repetition rate of 1 kHz. As targets were used Ti and stainless steel. Images from field emission scanning microscopy (Mira TESCAN) show that number pulses and fluence of incident laser irradiation affect to target's morphology as transfer from HSFl to LSFl. In special laser conditions such NS can co-exist as in melt bath of co-rectangle periodic structures with period from 10 to 1000 nm scale.
Presented experimental data was used as base for theoretical calculations of HSFL formation as wave mechanism [3,4].
Laser nanotechnologies discussed in this context have diverse applications, such as significantly boosting external applied field strength, altering antifriction properties, and creating structured surfaces with unique optical properties like ultra-black absorbance.
Additionally, the presentation will cover recent progress in understanding the mechanisms behind these structure formations, address current limitations, and explore emerging possibilities and future prospects.
[1] J. Reif, Dynamics and Processes on Laser-Irradiated Surfaces, Nanomaterials, 13, 379, (2023).
[2] J. Bonse and S. Graf, Maxwell meets, Laser & Photonics Reviews, 14(10), 2000215, (2020).
[3] N.A. Kirichenko, E.V. Barmina, G.A. Shafeev, Theoretical and Experimental Investigation of the Formation of High Spatial Frequency Periodic Structures on Metal Surfaces Irradiated by Ultrashort Laser Pulses, Physics of Wave Phenomena, 26(4), 264-273, (2018).
[4] S. Kuleshov and V.D. Kobtsev, Distribution of aluminum clusters and their ignition in air during dispersion of aluminum nanoparticles in a shock wave, Combustion, Explosion, and Shock Waves, vol. 56(5), pp. 566-575, (2020).
