scholarly journals Generalized Plasmonic Modelling of the Effect of Refractive Index on Laser-Induced Periodic Nanostructures

2019 ◽  
Vol 8 (2) ◽  
pp. 73-79
Author(s):  
A. Abdelmalek ◽  
Z. Bedrane ◽  
V. Bharadwaj ◽  
E.-H. Amara ◽  
R. Ramponi ◽  
...  
Keyword(s):  
Laser Irradiation ◽  
High Spatial Frequency ◽  
Refraction Index ◽  
Dielectric Materials ◽  
Laser Wavelength ◽  
Surface Structures ◽  
Femtosecond Laser Irradiation ◽  
Periodic Nanostructures ◽  
Periodic Surface ◽  
Wide Range

Laser-induced periodic surface structures (LIPSS) have been studied theoretically employing generalized plasmonic modelling on several dielectric materials such as SiO2, Al2O3, ZnO, AlAs and diamond exposed to 800 nm wavelength multi-pulse femtosecond laser irradiation. The study of the optical properties of the materials during laser irradiation reveals a formation of a metallic like pseudo-material on the irradiated layer during excitation. A study of the grating periodicity of the nanostructures shows that the materials having a high refraction index allow LIPSS formation with a wide range of grating periodicities. Results also show High Spatial Frequency LIPSS formation with periodicities 3 to 8 times lower than the laser wavelength.

Biocompatibility of Titanium Dioxide Film Modified by Femtosecond Laser Irradiation

2014 ◽  
Vol 783-786 ◽  
pp. 1377-1382 ◽  
Author(s):  
Masahiro Tsukamoto ◽  
Togo Shinonaga ◽  
Akiko Nagai ◽  
Kimihiro Yamashita ◽  
Takao Hanawa ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Femtosecond Laser ◽  
Laser Irradiation ◽  
Film Surface ◽  
Polarization Vector ◽  
Cell Spreading ◽  
Laser Wavelength ◽  
Femtosecond Laser Irradiation ◽  
Periodic Nanostructures ◽  
Cell Test

Titanium (Ti) is one of the most widely used for biomaterials, because of its excellent anti-corrosion and high mechanical properties. In addion to these properies, the bioactivity of Ti is required. Recently, coating of the titanium dioxide (TiO2) film on Ti plate surface is useful methods to obtain biocompatibility of Ti plate. If periodic nanostructures were formed on the film surface, direction of cell spreading might be controlled due to grooves direction. Then, femtosecond laser is one of the useful tools of periodic nanostructures formation. Peiriod of periodic nanostructures might be varied by changing the laser wavelength. In the experiments, the film was formed on Ti plate with an aerosol beam which was composed of submicron size TiO2 particles and helium gas. The film was irradiated with the femtosecond laser. Laser wavelengths of the laser was at 1044, 775 and 388 nm, respectively. Periodic nanostructures, lying perpendicular to the laser electric field polarization vector, were formed on the film by femtosecond laser irradiation at 1044, 775 and 388 nm, respectively. The period of the periodic nanostructures on the film produced by femtosecond laser irradiation at 1044, 775 and 388 nm was about 350, 230 and 130 nm, respectively. In the cell test, cell spreading along the grooves of the periodic nanostructures was observed although it was not done for the film without the periodic nanostructures. These results suggested that direction of cell spreading could be controlled by the periodic nanostructures formation

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.

scholarly journals Key role of surface plasmon polaritons in generation of periodic surface structures following single-pulse laser irradiation of a gold step edge

Nanophotonics ◽  
2022 ◽  
Vol 0 (0) ◽  
Author(s):  
Pavel N. Terekhin ◽  
Jens Oltmanns ◽  
Andreas Blumenstein ◽  
Dmitry S. Ivanov ◽  
Frederick Kleinwort ◽  
...  
Keyword(s):  
Laser Irradiation ◽  
Surface Plasmon ◽  
Surface Plasmon Polaritons ◽  
Single Pulse ◽  
Step Edge ◽  
Surface Structures ◽  
Femtosecond Laser Irradiation ◽  
Processing Technologies ◽  
Periodic Surface ◽  
Plasmon Polaritons

Abstract Understanding the mechanisms and controlling the possibilities of surface nanostructuring is of crucial interest for both fundamental science and application perspectives. Here, we report a direct experimental observation of laser-induced periodic surface structures (LIPSS) formed near a predesigned gold step edge following single-pulse femtosecond laser irradiation. Simulation results based on a hybrid atomistic-continuum model fully support the experimental observations. We experimentally detect nanosized surface features with a periodicity of ∼300 nm and heights of a few tens of nanometers. We identify two key components of single-pulse LIPSS formation: excitation of surface plasmon polaritons and material reorganization. Our results lay a solid foundation toward simple and efficient usage of light for innovative material processing technologies.

Fabrication and Control of Fine Periodic Surface Structures by Short Pulsed Laser

2016 ◽  
Vol 10 (4) ◽  
pp. 639-646 ◽  
Author(s):  
Shuhei Kodama ◽  
◽  
Akihiro Shibata ◽  
Shinya Suzuki ◽  
Keita Shimada ◽  
...  
Keyword(s):  
Laser Irradiation ◽  
Periodic Structures ◽  
Pulsed Laser ◽  
Limited Range ◽  
Laser Wavelength ◽  
Surface Structures ◽  
Periodic Surface ◽  
Pitch Length ◽  
Traditional Processing ◽  
And Control

Ultrashort-pulsed laser irradiation is a more efficient approach to the fabrication of fine surface structures than traditional processing methods. However, it has some problems: the equipment expenses usually increase as the pulse shortens, and the process principle has not been clarified completely, although the collisional relaxation time (CRT) is assumed to be a major factor. In this study, a 20-ps pulsed laser was employed to fabricate nanometer-sized periodic structures on a stainless steel alloy, SUS304. The pitch length of the fabricated fine periodic structures was similar to the laser wavelength, and the results suggested that periodic structures could be fabricated within a limited range of the laser fluence. In order to expand the effective fluence range (EFR) and to control the pitch length, laser irradiation was carried out with different workpiece temperatures and the laser wavelengths. In this way, CRT was extended and EFR was expanded by cooling the workpiece, and the pitch lengths were approximately equal to the laser wavelengths. As a result, two things were found: it is easier to fabricate the fine periodic structures by cooling the workpiece, and it is possible to control the pitch length of the fine periodic structures by changing the laser wavelength.

scholarly journals Fabricating Femtosecond Laser-Induced Periodic Surface Structures with Electrophysical Anisotropy on Amorphous Silicon

Nanomaterials ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 42
Author(s):  
Dmitrii Shuleiko ◽  
Mikhail Martyshov ◽  
Dmitrii Amasev ◽  
Denis Presnov ◽  
Stanislav Zabotnov ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Laser Irradiation ◽  
Volume Fraction ◽  
Femtosecond Laser Pulses ◽  
Surface Structures ◽  
Femtosecond Laser Irradiation ◽  
Nanocrystalline Phase ◽  
Near Surface ◽  
Periodic Surface ◽  
Relief Formation

One-dimensional periodic surface structures were formed by femtosecond laser irradiation of amorphous hydrogenated silicon (a-Si:H) films. The a-Si:H laser processing conditions influence on the periodic relief formation as well as correlation of irradiated surfaces structural properties with their electrophysical properties were investigated. The surface structures with the period of 0.88 and 1.12 μm were fabricated at the laser wavelength of 1.25 μm and laser pulse number of 30 and 750, respectively. The orientation of the surface structure is defined by the laser polarization and depends on the concentration of nonequilibrium carriers excited by the femtosecond laser pulses in the near-surface region of the film, which affects a mode of the excited surface electromagnetic wave which is responsible for the periodic relief formation. Femtosecond laser irradiation increases the a-Si:H films conductivity by 3 to 4 orders of magnitude, up to 1.2 × 10−5 S∙cm, due to formation of Si nanocrystalline phase with the volume fraction from 17 to 28%. Dark conductivity and photoconductivity anisotropy, observed in the irradiated a-Si:H films is explained by a depolarizing effect inside periodic microscale relief, nonuniform crystalline Si phase distribution, as well as different carrier mobility and lifetime in plane of the studied samples along and perpendicular to the laser-induced periodic surface structures orientation, that was confirmed by the measured photoconductivity and absorption coefficient spectra.

Formation of laser-induced periodic surface structures on niobium by femtosecond laser irradiation

2014 ◽  
Vol 115 (17) ◽  
pp. 173101 ◽  
Author(s):  
A. Pan ◽  
A. Dias ◽  
M. Gomez-Aranzadi ◽  
S. M. Olaizola ◽  
A. Rodriguez
Keyword(s):  
Femtosecond Laser ◽  
Laser Irradiation ◽  
Surface Structures ◽  
Femtosecond Laser Irradiation ◽  
Periodic Surface

Formation of laser-induced periodic surface structures on different materials: fundamentals, properties and applications

2020 ◽  
Vol 9 (1-2) ◽  
pp. 11-39 ◽  
Author(s):  
Stephan Gräf
Keyword(s):  
Friction And Wear ◽  
Review Paper ◽  
Laser Wavelength ◽  
Single Step ◽  
Surface Structures ◽  
Direct Writing ◽  
Periodic Surface ◽  
Experimental Approaches ◽  
Ordered Nanostructures ◽  
Physical Background

AbstractThe use of ultra-short pulsed lasers enables the fabrication of laser-induced periodic surface structures (LIPSS) on various materials following a single-step, direct-writing technique. These specific, well-ordered nanostructures with periodicities in the order of the utilised laser wavelength facilitate the engineering of surfaces with functional properties. This review paper discusses the physical background of LIPSS formation on substrates with different material properties. Using the examples of structural colours, specific wetting states and the reduction of friction and wear, this work presents experimental approaches that allow to deliberately influence the LIPSS formation process and thus tailor the surface properties. Finally, the review concludes with some future developments and perspectives related to forthcoming applications of LIPSS-based surfaces are discussed.

scholarly journals Effects of Pulse Duration and Heat on Laser-Induced Periodic Surface Structures

2020 ◽  
Vol 14 (4) ◽  
pp. 552-559
Author(s):  
Shuhei Kodama ◽  
Keita Shimada ◽  
Masayoshi Mizutani ◽  
Tsunemoto Kuriyagawa ◽  
◽  
...  
Keyword(s):  
Aspect Ratio ◽  
Pulse Duration ◽  
Pulse Laser ◽  
Pulsed Laser ◽  
Laser Wavelength ◽  
Surface Structures ◽  
Pulsed Lasers ◽  
Efficient Technology ◽  
Periodic Surface ◽  
Ultrashort Pulsed Lasers

Compared with traditional nanotexturing methods, an ultrashort-pulsed laser is an efficient technology of fabricating nanostructures called laser-induced periodic surface structures (LIPSS) on material surfaces. LIPSS are easily fabricated when the pulse duration is shorter than collisional relaxation time (CRT). Accordingly, ultrashort-pulsed lasers have been mainly used to study LIPSS, but they unstably irradiate while requiring high costs. Although long-pulsed lasers have low cost and high stability, the phenomena (such as the effect of pulse duration, laser wavelength, and heat) of the LIPSS fabricated using short-pulsed lasers with the pulse duration close to the maximum CRT, which is greater than femtosecond, have not been clarified. However, the nanosecond pulse laser has been reported to produce LIPSS, but those were unclear and ununiform. In this study, the short-pulsed laser with the pulse duration of 20 ps, which is close to the maximum CRT, was employed to clarify the effects of pulse duration and heat on the fabrication of LIPSS and to solve problems associated with ultrashort-pulsed lasers. First, a finite-difference time-domain simulation was developed at 20-ps pulse duration to investigate the effects of irradiation conditions on the electric-field-intensity distribution. Subsequently, experiments were conducted using the 20-ps pulse laser by varying conditions. The aspect ratio of the LIPSS obtained was greater than that of the LIPSS fabricated using ultrashort-pulsed lasers, but LIPSS were not fabricated at 355- and 266-nm laser wavelength. In addition, the short-pulsed laser experienced thermal influences and a cooling material was effective for the fabrication of LIPSS with high-aspect-ratio. This demonstrates the effects of pulse duration close to the CRT and heat on the fabrication of LIPSS.

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