scholarly journals Self-Organized Structuring of the Surface of a Metal–Semiconductor Composite by Femtosecond Laser Processing

2018 ◽  
Vol 63 (5) ◽  
pp. 406 ◽  
Author(s):  
N. Berezovska ◽  
I. Dmitruk ◽  
A. Kalyuzhnyy ◽  
A. Dmytruk ◽  
I. Blonskyi
Keyword(s):  
Femtosecond Laser ◽  
Low Frequency ◽  
Surface Barrier ◽  
Initial Surface ◽  
Semiconductor Substrate ◽  
Periodic Surface ◽  
Microstructured Surface ◽  
Self Organized ◽  
Femtosecond Laser Processing ◽  
Photoelectric Measurements

Peculiarities of the laser treatment of a composite consisting of a thin film of a metal (gold) on the surface of a semiconductor substrate [silicon (100)] have been studied. Micro- and nanostructurings of the metal-semiconductor composite sample have been achieved by the irradiation of its initial surface with a Ti : sapphire femtosecond laser. Laser ablation leads to the patterning of the surface of the composite with laser-induced periodic surface structures (LIPSS) and the formation of semiconductor nanohills, metal nanoparticles, and/or nanowires on the top of hills. The presence of some nanoscale surface features is confirmed by a low-frequency shift of the silicon phonon band in Raman spectra. Prepared microstructured surface barrier solar cells are characterized by means of scanning electron microscopy, optical spectroscopy, and photoelectric measurements.

scholarly journals Simultaneous Nano-Texturing onto a CVD-Diamond Coated Piercing Punch with Femtosecond Laser Trimming

2020 ◽  
Vol 10 (8) ◽  
pp. 2674 ◽  
Author(s):  
Tatsuhiko Aizawa ◽  
Tomomi Shiratori ◽  
Yoshihiro Kira ◽  
Tadahiko Inohara
Keyword(s):  
Femtosecond Laser ◽  
Surface Quality ◽  
Chemical Vapor ◽  
Side Surface ◽  
Chemical Vapor Deposition Diamond ◽  
Diamond Coating ◽  
Periodic Surface ◽  
Femtosecond Laser Processing ◽  
Edge Profile

In this study, a CVD (Chemical Vapor Deposition)-diamond coated tungsten carbide cobalt (WC (Co)) punch was trimmed to adjust its surface roughness and to significantly reduce its edge curvature for fine piercing by femtosecond laser processing. Through this laser trimming, the surface quality of the diamond coating and the punch edge profile were improved to less than 0.5 μm at the maximum roughness and 2 μm in the edge width, respectively. In parallel with this improvement of surface quality, the side surface of the diamond coating was modified to include nano-textures via the LIPSS (Laser Induced Periodic Surface Structuring) process. Through the fine piercing process, this nanotexture was transcribed onto the pierced hole surface together with fine shearing of the hole by piercing. WLI (White-Light Interferometry) and SEM (Scanning Electron Microscopy) were utilized to describe this transcription of nanotextures during the piercing process. These semiregular nanotextures with an LIPSS period of 300 nm on the pierced hole surface induced a blue colored surface plasmon.

Ultrafast Dynamics of Sub-Wavelength Periodic Surface Structuring during Femtosecond Laser Processing of Dielectrics

2014 ◽  
Vol 1035 ◽  
pp. 426-431
Author(s):  
Yan Ping Yuan ◽  
Ji Min Chen ◽  
Fu Rong Liu
Keyword(s):  
Femtosecond Laser ◽  
Laser Fluence ◽  
Chemical Characteristic ◽  
Quantum Model ◽  
Electron Dynamics ◽  
Periodic Surface ◽  
Ablation Crater ◽  
Surface Structuring ◽  
Femtosecond Laser Processing ◽  
Sub Wavelength

A femtosecond laser pulse duration is shorter than many physical/chemical characteristic times, which makes it possible to control electron dynamics such as ionizations and electron densities. This study expermetally investigtes the effects of laser fluence on sub-wavelength periodic surface structuring based on ultrafast laser electron dynamics control. A quantum model for the sub-wavelength periodic surface structuring is also proposed, which considers both the wave properties in the photon particle-properties based plasma model for photon-electron interactions and transient localized changes of material properties. It shows that the laser fluence strongly affects the ablation crater shapes. The prediction of ablation crater shape and periodicity is in agreement with experimental data.

Ultrafast Laser Induced Subwavelength Periodic Surface Structures on Semiconductors/Metals and Application to SERS Studies

MRS Advances ◽  
2016 ◽  
Vol 1 (49) ◽  
pp. 3317-3327 ◽  
Author(s):  
V. Saikiran ◽  
Mudasir H Dar ◽  
R. Kuladeep ◽  
Narayana Rao Desai
Keyword(s):  
Femtosecond Laser ◽  
Laser Irradiation ◽  
Gold Film ◽  
Low Frequency ◽  
Surface Enhanced Raman Spectroscopy ◽  
Surface Structures ◽  
Femtosecond Laser Irradiation ◽  
Gold Films ◽  
Periodic Surface ◽  
Different Thickness

ABSTRACTIn this manuscript a simple approach is discussed to fabricate uniform periodic surface structures on semiconductor surfaces by femtosecond laser irradiation for surface-enhanced Raman spectroscopy (SERS) applications. Gold films having different thickness are first deposited on semiconductor silicon (Si) surfaces and then periodic surface structures are fabricated by femtosecond laser irradiation. The periodic structures are observed to be uniform over a large area with chain type structure formation of gold and Si. We have studied the formation of these surface structures on Si surface by having different thickness gold films deposited on Si substrates. This approach of the fabrication of surface structures with the assistance of gold film is found to help in local field enhancement and hence work as suitable substrate for the SERS experiments. The conditions for achieving high enhancement factor in SERS with different gold film thicknesses are explored in detail. We also present here the formation of low frequency ripples on Silicon (Si) and high frequency as well as low frequency ripples on titanium (Ti) surface in air and water environments by irradiation with fs laser pulses. Different morphologies were observed on Ti surface depending upon the laser irradiation parameters and the surrounding dielectric medium.

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

scholarly journals Laser radiation impact on a solid surface and formation of micro- and nanostructures

2019 ◽  
Vol 220 ◽  
pp. 01010 ◽  
Author(s):  
Dmitriy Kochuev ◽  
Ruslan Chkalov ◽  
Valery Prokoshev ◽  
Kirill Khorkov
Keyword(s):  
Laser Radiation ◽  
Femtosecond Laser ◽  
Solid Surface ◽  
Laser Processing ◽  
Surface Structures ◽  
Periodic Surface ◽  
Femtosecond Laser Processing

The work is devoted to the problem of microand nanostructuring of the surface of solids as a result of exposure to laser radiation. The method of forming periodic surface structures by means of femtosecond laser processing is presented using the example of solving the problem of titanium structuring.

scholarly journals Improving Tribological Properties of Stainless Steel Surfaces by Femtosecond Laser Irradiation

Coatings ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 606
Author(s):  
Serguei P. Murzin ◽  
Valeriy B. Balyakin ◽  
Gerhard Liedl ◽  
Alexey A. Melnikov ◽  
Roland Fürbacher
Keyword(s):  
Stainless Steel ◽  
Femtosecond Laser ◽  
Laser Irradiation ◽  
Tribological Properties ◽  
Femtosecond Laser Irradiation ◽  
Test Scheme ◽  
Periodic Surface ◽  
Self Organized ◽  
The Coefficient Of Friction ◽  
Pin On Disk

A possibility of improving tribological properties by femtosecond laser irradiation on an example of a steel surface by creating regularly arranged micro-grooved textures that contain self-organized microstructures and nano laser-induced periodic surface structures (LIPSS) was determined. The friction coefficient of the treated surface of a sample of cold-rolled 1.4301 stainless steel was evaluated using a CSM Instruments SA tribometer according to a Pin-on-disk test scheme at a specific pressure of 1 MPa. It was found that the coefficient of friction was reduced by 35% compared to the initial grinded surface. Such laser treatment can find application for using parts in conditions of dry or boundary friction, mainly in units, in which the use of lubricant is unacceptable or extremely undesirable.

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