Effect of polymer permittivity on periods of LIPSS formed on titanium with femtosecond laser pulses

Takenaka, Keisuke; Sato, Yuji; Tsukamoto, Masahiro

doi:10.1007/s00339-022-06034-6

Cited by 1 publication

(1 citation statement)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Irradiating a femtosecond laser beam onto a metal or semiconductor surface with fluence near the ablation threshold forms laser-induced periodic surface structures (LIPSS) 1,2 . The direction and period of LIPSS depend on the laser irradiation conditions such as target material, laser fluence, laser polarization, number of pulses, incidence angle, and laser wavelength 3,4 . LIPSS exhibits novel functionalities such as structural color, controlled surface wettability, improved biocompatibility, friction reduction, and enhanced solar cell performance 5,6 .…”

Section: Introductionmentioning

confidence: 99%

Effect of polarization angle on laser-induced periodic surface structures by a two-color double-pulse femtosecond beam irradiation

Yamamoto

Takenaka

Sato

et al. 2023

Laser Applications in Microelectronic and Optoelectronic Manufacturing (LAMOM) XXVIII

View full text Add to dashboard Cite

Titanium (Ti) is widely used for biomaterials such as an implant for human body due to its excellent anti-corrosion. However, new functions should be added to Ti substrates because a strong revival is slow in a joint with a bone. A useful method is periodic nano structure formation on a material to control cell spreading and promote the osteogenic differentiation of cells. When a femtosecond laser is irradiated on a Ti plate at a fluence of near the ablation threshold, periodic nano structures are formed in the direction of perpendicular to the polarization angle of the laser pulse. In our previous study, it was found that the direction of cell was spread by periodic nano structures formed on Ti plate. For the controllability improvement of the cell spreading direction, it is required to improve the uniformity of periodic nano structures. Since the period of nano structures depend on the target material, irradiation fluence, number of irradiation-pulses, incidence angle, and laser wavelength, it is difficult to control the uniformity. In this study, to improve the uniformity of nano structures, Ti plate was irradiated by two-color double-pulse irradiation with a femtosecond laser at the wavelength of 800 nm. As the results, when the 800 nm and 400 nm pulses had orthogonal polarization directions, high uniformity of periodic nano structure was formed.

show abstract