Abstract
Laser induced periodic surface structures (LIPSS) are generated on titanium and silicon nitride surfaces by multiple femtosecond laser pulses. An optical imaging system is used to observe the backscattered light during the patterning process. A characteristic fringe pattern in the backscattered light is observed and evidences the surface modification. Experiments are complemented by finite difference time domain numerical simulations which clearly show that the periodic surface modulation leads to characteristic modulations in the coherently scattered light field. It is proposed that these characteristic fringe pattern can be used as a very fast and low-cost monitor of LIPSS formation formation during the manufacturing process.
Highlights
Laser induced periodic surface structures (LIPSS) have been in the focus of surface functionalization for a many years
In this work we investigate the origin of the fringe pattern with the help of of a 3D Maxwell solver based on the finite difference time domain (FDTD) method
In this work we have described an optical setup which is capable to monitor the appearance of laser induced periodic surface structures
Summary
Laser induced periodic surface structures (LIPSS) have been in the focus of surface functionalization for a many years. LIPSS are easy to fabricate with femtosecond laser systems of moderate power and have found widely spread application (cf e.g., Reference [12] and references therein) influencing the physical and chemical properties of surfaces. They can be applied to control wettability and friction of surfaces [13,14], to generate structural colors [15] or to optimize cell growth in biomedical applications [16]. The orientation of the LIPSS depends on their type and the material
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