Femtosecond laser-induced periodic surface structures on diamond-like nanocomposite films

Pimenov, S.M.; Zavedeev, E.V.; Arutyunyan, N.R.; Jaeggi, B.; Neuenschwander, Beat (2022). Femtosecond laser-induced periodic surface structures on diamond-like nanocomposite films Diamond and Related Materials, 130, p. 109517. Elsevier 10.1016/j.diamond.2022.109517

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We study the formation of laser-induced periodic surface structures (LIPSS) on diamond-like nanocomposite (DLN) a-C:H:Si:O films and titanium-doped DLN films during femtosecond (fs) laser ablation processing with linearly-polarized beams of IR and visible fs-lasers (wavelengths 1030 nm and 515 nm, pulse duration 320 fs, pulse repetition rates 100 kHz-2 MHz, scanning beam velocity 0.04–0.4 m/s). The studies are focused on (i) comparison of high spatial frequency LIPSS (HSFL) and low spatial frequency LIPSS (LSFL) formed on DLN and Ti-DLN films by IR fs-laser processing, (ii) effects of the pulse repetition rate on the parameters of LIPSS formed on the DLN and Ti-DLN films, (iii) Raman spectroscopy analysis of the LIPSS-structured films with application for ultrathin surface graphitization, and (iv) relationship between the fs-laser-induced surface graphitization and LIPSS formation on the films. A variety of the HSFL and LSFL have been produced on the surface of DLN and Ti-DLN films, with all the LIPSS being oriented perpendicular to the beam polarization direction. The HSFL periods are varied from ~80 to 240 nm and the LSFL periods are varied from 355 to 840 nm, depending on the fs-laser irradiation conditions (wavelength, fluence, pulse repetition rate) and films properties. Various plasmonic effects such as the superposition of the HSFL and LSFL and emergence of very unusual sinusoid-like structures on the DLN and Ti-DLN films are presented and discussed.

Item Type:	Journal Article (Original Article)
Division/Institute:	School of Engineering and Computer Science > Institute for Surface Applied Laser, Phototonics and Surface Technologies ALPS > ALPS / Laser Surface Engineering School of Engineering and Computer Science
Name:	Pimenov, S.M.; Zavedeev, E.V.; Arutyunyan, N.R.; Jaeggi, B. and Neuenschwander, Beat0000-0001-9715-8557
Subjects:	Q Science > QC Physics
ISSN:	09259635
Publisher:	Elsevier
Language:	English
Submitter:	Beat Neuenschwander
Date Deposited:	14 Nov 2022 15:58
Last Modified:	14 Nov 2022 15:58
Publisher DOI:	10.1016/j.diamond.2022.109517
Uncontrolled Keywords:	Diamond-like nanocomposite (DLN) films; Ti-doped DLN films; Femtosecond laser; ablation; Spallation; Laser-induced periodic surface structures; (LIPSS); Graphitization; Raman spectroscopy
ARBOR DOI:	10.24451/arbor.17942
URI:	https://arbor.bfh.ch/id/eprint/17942