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

Surfaces ◽  
2019 ◽  
Vol 2 (2) ◽  
pp. 277-294
Author(s):  
Robin Wehner ◽  
Ruediger Grunwald
Keyword(s):  
Surface Structures ◽  
Pump Probe ◽  
Periodic Surface ◽  
Fundamental Interest ◽  
Self Organized ◽  
Spatial Frequencies ◽  
Linearly Polarized ◽  
General Aspects ◽  
Excitation Conditions

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.

scholarly journals Enhanced Absorptance of 45# Steel by Laser-Induced Periodic Surface Structures (LIPSS)

Metals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1237 ◽  
Author(s):  
Tianyu Wang ◽  
Jintian Bian ◽  
Xin Li ◽  
Hui Kong ◽  
Lei Wang ◽  
...  
Keyword(s):  
Room Temperature ◽  
Near Infrared ◽  
Damage Threshold ◽  
Vital Role ◽  
Surface Structures ◽  
Integrating Sphere ◽  
Infrared Band ◽  
Periodic Surface ◽  
Spot Area ◽  
Linearly Polarized

The absorptance of metals is often low within the visible and near-infrared band at room temperature. Increasing the absorption of metals plays a vital role in reducing energy consumption and production cost. After irradiation by 10 ns linearly polarized pulses with fluence close to the zero-probability damage threshold, the surface of 45# steel samples exhibited four kinds of surface structures in the spot area. The samples’ absorptance is improved by 38% when a high-quality laser-induced surface structure (LIPSS) appears at the spot centre. With the increase of the number of pulses, LIPSS begin to melt down, which will decrease the surface absorptance due to the appearance of damage stripes. The relative absorptance of samples was measured by an integrating sphere system. The paper reports detailed experiments to show that LIPSS can improve samples’ absorptance significantly.

F2-Laser Angle Nanomodification of PET

2007 ◽  
Vol 567-568 ◽  
pp. 257-260
Author(s):  
Petr Slepička ◽  
J. Heitz ◽  
Jakub Siegel ◽  
M. Špírková ◽  
Václav Švorčík
Keyword(s):  
Atomic Force Microscopy ◽  
Laser Irradiation ◽  
Laser Light ◽  
Periodic Structures ◽  
Surface Structures ◽  
Periodic Surface ◽  
Force Microscopy ◽  
Atomic Force ◽  
Linearly Polarized ◽  
Pet Foils

This work is focused on laser modification of polymers with different angles of incidence. Periodic surface structures generated by linearly polarized F2 laser light (157 nm) on polyethyleneterephthalate (PET) were studied. Atomic force microscopy was used to study the topological changes induced by the laser irradiation. The laser irradiation induces the formation of periodic ripple structures, the width of and the height being angle dependent. The periodic structures were formed with the laser fluence 4.70 mJ/cm2. The laser modified PET foils were coated with a 50 nm thick gold layer by sputtering. After Au deposition on the laser PET foils with ripple structure, the roughness of surface decreases in comparison to PET with ripples without Au coating.

Role of nanoparticles generation in the formation of femtosecond laser-induced periodic surface structures on silicon

2017 ◽  
Vol 42 (17) ◽  
pp. 3315 ◽  
Author(s):  
Hongyan Xue ◽  
Guoliang Deng ◽  
Guoying Feng ◽  
Lin Chen ◽  
Jiaqi Li ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Surface Structures ◽  
Periodic Surface

scholarly journals On the Role of a ZDDP in the Tribological Performance of Femtosecond Laser-Induced Periodic Surface Structures on Titanium Alloy against Different Counterbody Materials

Lubricants ◽  
2019 ◽  
Vol 7 (9) ◽  
pp. 79 ◽  
Author(s):  
Ayerdi ◽  
Slachciak ◽  
Llavori ◽  
Zabala ◽  
Aginagalde ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Femtosecond Laser ◽  
Tribological Performance ◽  
Surface Structures ◽  
Periodic Surface ◽  
Base Oil ◽  
Zinc Dithiophosphate ◽  
Titanium Alloy Ti6al4v ◽  
Scanning Electron

Laser-induced periodic surface structures (LIPSS, ripples) with ~500–700 nm period were produced on titanium alloy (Ti6Al4V) surfaces upon scan processing in air by a Ti:sapphire femtosecond laser. The tribological performance of the surfaces were qualified in linear reciprocating sliding tribological tests against balls made of different materials using different oil-based lubricants. The corresponding wear tracks were characterized by optical and scanning electron microscopy and confocal profilometry. Extending our previous work, we studied the admixture of the additive 2-ethylhexyl-zinc-dithiophosphate to a base oil containing only anti-oxidants and temperature stabilizers. The presence of this additive along with the variation of the chemical composition of the counterbodies allows us to explore the synergy of the additive with the laser-oxidized nanostructures.

scholarly journals Adjustment of Surface Morphologies of Subwavelength-Rippled Structures on Titanium Using Femtosecond Lasers: The Role of Incubation

2019 ◽  
Vol 9 (16) ◽  
pp. 3401
Author(s):  
Yanping Yuan ◽  
Dongfang Li ◽  
Weina Han ◽  
Kai Zhao ◽  
Jimin Chen
Keyword(s):  
Laser Pulse ◽  
Titanium Surface ◽  
Femtosecond Lasers ◽  
Pulse Number ◽  
Surface Structures ◽  
Processing Efficiency ◽  
Periodic Surface ◽  
Multiple Shot ◽  
Surface Morphologies

Laser-induced periodic surface structures have been extensively studied for various materials because of their promising applications. For these applications, uniform rippled structures with well-defined large areas are required. However, the efficient fabrication of uniform rippled structures is a challenge. Morphologies of rippled structures of multiple-shot-ablated regions considerably affect the processing efficiency of uniform rippled structures because incubation effects are crucial. In this study, the effects of a pulse number and irradiation modes on surface morphologies of rippled structures on the titanium surface are experimentally studied. The experimental results indicate the following: (1) Samples first irradiated using several shots and then using remaining shots by designing laser pulse irradiation modes exhibit improved surface morphologies, such as larger ablation areas and finer rippled structures. (2) When the pulse number in the first series is less than that in the second series, the rippled structures are characterized using larger areas and periods. (3) The ablated areas with rippled structures increase with the increasing number of pulses. (4) The periods of ripples reduce with the increasing number of pulses. Therefore, according to different requirements, uniform rippled structures can be efficiently fabricated and adjusted using the designed laser pulse modes and pulse number.

Self-organized periodic surface structures on ZnO induced by femtosecond laser

2010 ◽  
Vol 100 (2) ◽  
pp. 517-521 ◽  
Author(s):  
Lingling Ran ◽  
Zhongyi Guo ◽  
Shiliang Qu
Keyword(s):  
Femtosecond Laser ◽  
Surface Structures ◽  
Periodic Surface ◽  
Self Organized

scholarly journals Periodic Surface Structures Self-Organized on Solid Materials Ablated by Femtosecond Laser Pulses

2015 ◽  
Vol 43 (11) ◽  
pp. 745
Author(s):  
HASHIDA Masaki ◽  
Yasuhiro MIYASAKA ◽  
Masahiro SHIMIZU ◽  
Hitoshi SAKAGAMI ◽  
Shunsuke INOUE ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Surface Structures ◽  
Solid Materials ◽  
Periodic Surface ◽  
Self Organized

Periodic surface structures on titanium self-organized upon double femtosecond pulse exposures

2015 ◽  
Vol 336 ◽  
pp. 349-353 ◽  
Author(s):  
Laura Gemini ◽  
Masaki Hashida ◽  
Yasuhiro Miyasaka ◽  
Shunsuke Inoue ◽  
Jiri Limpouch ◽  
...  
Keyword(s):  
Femtosecond Pulse ◽  
Surface Structures ◽  
Periodic Surface ◽  
Self Organized

Pump-probe imaging of laser-induced periodic surface structures after ultrafast irradiation of Si

2013 ◽  
Vol 103 (14) ◽  
pp. 141104 ◽  
Author(s):  
Ryan D. Murphy ◽  
Ben Torralva ◽  
David P. Adams ◽  
Steven M. Yalisove
Keyword(s):  
Surface Structures ◽  
Pump Probe ◽  
Periodic Surface
Sign in / Sign up

Export Citation Format

Share Document