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liquid vortexes and flows induced by femtosecond laser ablation in liquid governing formation of circular and crisscross LIPSS

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Opto-Electronic Advances 2022年第2期5卷 1-12页

作者： Dongshi Zhang Xinzhuo Li Yao Fu Qinghe Yao Zhuguo Li Koji Sugioka Shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China RIKEN Center for Advanced Photonics 2-1 HirosawaWakoSaitama 351-0198Japan School of Aeronautics and Astronautics Sun Yat-sen UniversityGuangzhou 510275China State Key Lab of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China

Orientations of laser induced periodic surface structures(LIPSS)are usually considered to be governed by the laser polarization *** this work,we unveil that fluid dynamics induced by femtosecond(fs)laser ablation in liquid(fs-LAL)can easily break this polarization restriction to produce irregular circular-LIPSS(CLIPPS)and crisscross-LIPSS(CCLIPSS).Fs laser ablation of silicon in water shows formation of diverse LIPSS depending on ablation *** a high power of 700 mW(repetition rate of 100 kHz,pulse duration of 457 fs and wavelength of 1045 nm),single/twin CLIPSS are produced at the bottom of macropores of several microns in diameter due to the formation of strong liquid vortexes and occurrence of the vortex shedding *** simulations validate our speculation about the formation of liquid vortex with an ultrahigh static pressure,which can induce the microstructure trenches and cracks at the sidewalls for fs-LAL of Si and tungsten(W)in water,*** a low power of 50 mW,weak liquid vortexes are produced,which only give birth to curved LIPSS in the valleys of ***,it is deduced that liquid vortex plays a crucial role in the formation of ***-like microstructures induce complex fluid dynamics which can cause the formation of CCLIPSS on *** is believed that liquid vortexes and fluid dynamics presented in this work open up new possibilities to diversify the morphologies of LIPSS formed by fs-LAL.

关键词： circular LIPSS crisscross LIPSS laser ablation in liquid femtosecond laser ablation in water liquid vortex vortex shedding

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