Sub-Threshold Fabrication of Laser-Induced Periodic Surface Structures on Diamond-like Nanocomposite Films with IR Femtosecond Pulses

Pimenov, Sergei M.; Zavedeev, Evgeny V.; Jaeggi, Beat; Zürcher, Josef; Neuenschwander, Beat (2022). Sub-Threshold Fabrication of Laser-Induced Periodic Surface Structures on Diamond-like Nanocomposite Films with IR Femtosecond Pulses Materials, 15(13), pp. 1-13. Molecular Diversity Preservation International (MDPI) 10.3390/ma15134506

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In the paper, we study the formation of laser-induced periodic surface structures (LIPSS) on diamond-like nanocomposite (DLN) a-C:H:Si:O films during nanoscale ablation processing at low fluences—below the single-pulse graphitization and spallation thresholds—using an IR fs-laser (wavelength 1030 nm, pulse duration 320 fs, pulse repetition rate 100 kHz, scanning beam velocity 0.04–0.08 m/s). The studies are focused on microscopic analysis of the nanostructured DLN film surface at different stages of LIPSS formation and numerical modeling of surface plasmon polaritons in a thin graphitized surface layer. Important findings are concerned with (i) sub-threshold fabrication of high spatial frequency LIPSS (HSFL) and low spatial frequency LIPSS (LSFL) under negligible surface graphitization of hard DLN films, (ii) transition from the HSFL (periods of 140 ± 30 and 230 ± 40 nm) to LSFL (period of 830–900 nm) within a narrow fluence range of 0.21–0.32 J/cm2, (iii) visualization of equi-field lines by ablated nanoparticles at an initial stage of the LIPSS formation, providing proof of larger electric fields in the valleys and weaker fields at the ridges of a growing surface grating, (iv) influence of the thickness of a laser-excited glassy carbon (GC) layer on the period of surface plasmon polaritons excited in a three-layer system “air/GC layer/DLN film”.

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, Sergei M.;
Zavedeev, Evgeny V.;
Jaeggi, Beat;
Zürcher, Josef and
Neuenschwander, Beat0000-0001-9715-8557

Subjects:

Q Science > QC Physics
T Technology > TA Engineering (General). Civil engineering (General)

ISSN:

1996-1944

Publisher:

Molecular Diversity Preservation International (MDPI)

Language:

English

Submitter:

Beat Neuenschwander

Date Deposited:

20 Jul 2022 08:20

Last Modified:

20 Jul 2022 08:20

Publisher DOI:

10.3390/ma15134506

Uncontrolled Keywords:

diamond-like nanocomposite (DLN) films; femtosecond laser; ablation; spallation; laser-induced periodic surface structures (LIPSS); surface plasmon polaritons

ARBOR DOI:

10.24451/arbor.17202

URI:

https://arbor.bfh.ch/id/eprint/17202

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