Experimental study of fs-laser induced sub-100-nm periodic surface structures on titanium

Nathala, Chandra Sekher; Ajami, Aliasghar; Ионин, А. А.; Kudryashov, S. I.; Makarov, Sergey; Ganz, Thomas; Assion, A.; Husinsky, W.

doi:10.1364/oe.23.005915

Cited by 100 publications

(85 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The pronounced ablation at scratches has been put in context of field enhancement as has been described recently. [34] In contrast to LIPSS formation at femtosecond laser ablation, [26,27] we find no ordered (or lamellar) surface structuring. The surface rather develops splash and finger structures, the latter having a micrometer diameter and thus efficiently modifying light reflection.…”

Section: Incubation On Silver and Gold Targets At Low Fluencementioning

confidence: 74%

“…In particular, we find that corrugation here is on a micrometer scale, comparable to the laser wavelength. It is self‐organized in size and morphology by the laser‐surface interaction reminding of structure formation, for femtosecond laser pulses. Figure shows scanning electron microscope images of a Au target surface after a different number of applied shots of 1 mJ pulse energy.…”

Section: Resultsmentioning

confidence: 99%

“…The decreasing loss of laser energy due to an increased surface roughness can be correlated to an increased absorptance or decreased reflectance . This increase in absorptance can be referred to the formation of laser‐induced periodic surface structures (LIPSS) or ripples for ablation with femtosecond laser pulses ,. They can appear already within the first shots if the applied fluence is high enough ,.…”

Section: Introductionmentioning

confidence: 99%

“…[25] This increase in absorptance can be referred to the formation of laser-induced periodic surface structures (LIPSS) or ripples for ablation with femtosecond laser pulses. [26,27] They can appear already within the first shots if the applied fluence is high enough. [24,28] Nanosecond pulses normally do not induce periodic structures.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Incubation Effect of Pre‐Irradiation on Bubble Formation and Ablation in Laser Ablation in Liquids

et al. 2019

View full text Add to dashboard Cite

Pulsed laser ablation in liquids (PLAL) is a multi‐scale process, which is widely studied either in batch ablation with prolonged target irradiation as well as mechanistic investigations, in a defined (single‐shot) process. However, fundamental studies on defined pulse series are rare. We have investigated the effect of a developing rough morphology of the target surface on the PLAL process with nanosecond pulses and, partially, picosecond pulses. At low fluence the cavitation bubble growth as well as the ablation yield depend on the irradiation history of the target. The bubble size increases with repeated irradiation on one spot for the first 2–30 pulses as well as with the applied dose. This is discussed within the framework of incubation effects. Incubation is found to be important, resulting in a bubble volume increase by a factor of six or more between pristine and corrugated targets. The target surface, changing from smooth to corrugated, induces a more efficient localization of laser energy at the solid‐liquid interface. This is accompanied by a suppressed reflectivity and more efficient coupling of energy into the laser‐induced plasma. Thus, the cavitation bubble size increases as well as ablation being enhanced. At high fluence, such incubation is masked by the rapid development of surface damage within the first shots, which eventually would lead to a reduction of bubble sizes.

show abstract

Section: Incubation On Silver and Gold Targets At Low Fluencementioning

confidence: 74%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Incubation Effect of Pre‐Irradiation on Bubble Formation and Ablation in Laser Ablation in Liquids

et al. 2019

View full text Add to dashboard Cite

show abstract

“…For metals like Ti, Al, and Au, it was shown that nanoscale surface boiling plays a role in sub-threshold damage, as well as above-threshold spallation by femtosecond laser pulses [39,40]. Although thermal material modification and rearrangement were detected at different time scales compared to the exciting light pulses, the ripple formation is significantly influenced by plasmons initially induced by the ultrafast laser pulses [39].…”

Section: Introductionmentioning

confidence: 99%

Feedback-Driven Plasmonic-Thermal Route to Femtosecond-Laser-Induced Periodic Surface Structures in Silicon Indicated by Pump-Probe Scattering and Diffraction

Wehner

Grünwald

2019

Surfaces

View full text Add to dashboard Cite

The self-organized formation of nanoscale laser-induced periodic surface structures (LIPSS) is still not fully understood with respect to the dynamics and interplay of contributing complex mechanisms. The transition from randomness to order and the specific role of nano-feedback are of fundamental interest because of their general aspects. In our study, the very first steps of the surface reconfiguration are demonstrated by analyzing the topology of evolving nano-crater maps. The evolution of spatial frequencies and directional arrangement indicate a feedback-driven adaptation of k-vectors to the required excitation conditions of elementary dipoles in the linearly polarized laser field. The time-dependent structure formation was studied by pump-probe diffraction and scattering experiments. The ratio of the contributions of characteristic light patterns enables plasmonic and non-plasmonic mechanisms to be distinguished, which subsequently act at distinctly different time scales. Recently developed multistage models for the dynamics of material modification are confirmed. The influence of accumulation effects is clearly demonstrated by characteristic changes in scattering and diffraction with an increasing number of preceding pulses. It is assumed that the thermal and plasmonic contributions to accumulation are coupled and thus generate spatially variable modifications.

show abstract

Surface Modification of Fluorine‐Doped Tin Oxide Thin Films Using Femtosecond Direct Laser Interference Patterning: A Study of the Optoelectronic Performance

et al. 2023

View full text Add to dashboard Cite

The first transparent conductive oxide (TCO) was introduced by Karl Bädeker in 1907, more than 110 years ago. [1] It was a thin film of cadmium oxide (CdO) prepared by oxidizing a vacuum-sputtered film of cadmium metal. By the same method, the first film of tin oxide (SnO 2 ) was obtained in 1937 by Gerhard Bauer. [2] Currently, different TCOs are being employed in the optoelectronic industry such as aluminum-doped zinc oxide (AZO), indium-doped tin oxide (ITO), and fluorine-doped tin oxide (FTO). The latter has been extensively used as it possesses low fabrication costs compared to ITO because indium is a very scarce element on Earth, [3] high thermal resistance, and good electronic compatibility with many semiconductors. [4,5] To ensure the high performance of optoelectronic devices, two features are key for TCOs: high optical transmittance in the spectral range of interest and low electrical resistivity. Besides, a high level of diffuse spectral transmittance has been demonstrated to further enhance sunlight absorption in the photoactive material on many different solar cell technologies. [6][7][8][9][10] Particularly in FTO, numerous strategies were applied to achieve these goals, for instance, by changing the doping concentration of fluorine, [11] by performing a surface chemical etching, [12] by laser annealing, [13] or by laser ablation. [14,15] In the field of laser ablation, efforts have been carried out to develop different approaches to structure the surface without deteriorating the material's intrinsic properties, which could affect the optoelectronic performance of the device in which it will be employed. Saetang et al. [16] structured FTO with an infrared (IR) ns-pulsed laser, generating line-like structures by means of a stream of water between the laser source and the conductive film. The results showed a reduction of the burr height index of 62.5% (relative) which is a critical parameter to reduce the intermittency between different thin layers in solar cells. Moreover, Kim et al. [17] textured FTO for dye-sensitized solar cells (DSSCs) by using a continuous wave Nd:YAG infrared laser and obtained an 8.1% increase in the incident-photon-to-current efficiency (IPCE) compared to the solar cell based on unstructured FTO.Regarding laser techniques, direct laser interference patterning (DLIP) has become an industrial-compatible technique able to produce large-area periodic surface micro-and nanostructures on a broad range of materials. [18,19] Berger et al. [20] used DLIP to structure ZnO:B thin films with an UV ns-laser and achieved a

show abstract

Experimental study of fs-laser induced sub-100-nm periodic surface structures on titanium

Cited by 100 publications

References 38 publications

Incubation Effect of Pre‐Irradiation on Bubble Formation and Ablation in Laser Ablation in Liquids

Incubation Effect of Pre‐Irradiation on Bubble Formation and Ablation in Laser Ablation in Liquids

Feedback-Driven Plasmonic-Thermal Route to Femtosecond-Laser-Induced Periodic Surface Structures in Silicon Indicated by Pump-Probe Scattering and Diffraction

Surface Modification of Fluorine‐Doped Tin Oxide Thin Films Using Femtosecond Direct Laser Interference Patterning: A Study of the Optoelectronic Performance

Contact Info

Product

Resources

About