Formation of organic layer on femtosecond laser-induced periodic surface structures
| Autor: | Junsuke Kiuchi, Eisuke Sentoku, Naoki Yasumaru |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
General Physics and Astronomy 02 engineering and technology Surface finish 01 natural sciences Molecular physics Fluence law.invention Optics X-ray photoelectron spectroscopy law 0103 physical sciences Surface roughness Thin film 010302 applied physics business.industry Surfaces and Interfaces General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Laser Polarization (waves) Surfaces Coatings and Films Femtosecond 0210 nano-technology business |
| Zdroj: | Applied Surface Science. 405:267-272 |
| ISSN: | 0169-4332 |
| DOI: | 10.1016/j.apsusc.2017.02.084 |
| Popis: | Two types of laser-induced periodic surface structures (LIPSS) formed on titanium by femtosecond (fs) laser pulses (λ = 800 nm, τ = 180 fs, ν = 1 kHz) in air were investigated experimentally. At a laser fluence F above the ablation threshold, LIPSS with a minimum mean spacing of D λ⁄2 were observed perpendicular to the laser polarization direction. In contrast, for F slightly below than the ablation threshold, ultrafine LIPSS with a minimum value of D λ/10 were formed parallel to the polarization direction. The surface roughness of the parallel-oriented LIPSS was almost the same as that of the non-irradiated surface, unlike the high roughness of the perpendicular-oriented LIPSS. In addition, although the surface state of the parallel-oriented LIPSS was the same as that of the non-irradiated surface, the perpendicular-oriented LIPSS were covered with an organic thin film similar to a cellulose derivative that cannot be easily formed by conventional chemical synthesis. The results of these surface analyses indicate that these two types of LIPSS are formed through different mechanisms. This fs-laser processing technique may become a new technology for the artificial synthesis of cellulose derivatives. |
| Databáze: | OpenAIRE |
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