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

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.

Download Full-text

Comprehensive ablation study of near-IR femtosecond laser action on the titanium-based alloy Ti6Al4V: morphological effects and surface structures at low and high fluences

The European Physical Journal D ◽

10.1140/epjd/s10053-021-00308-z ◽

2022 ◽

Vol 76 (1) ◽

Author(s):

Dubravka Milovanović ◽

Boris Rajčić ◽

Sanja Petronić ◽

Aleksandra Radulović ◽

Bojan Radak ◽

...

Keyword(s):

Laser Action ◽

Damage Threshold ◽

Single Pulse ◽

Surface Structures ◽

Periodic Surface ◽

Spot Area ◽

High Fluences ◽

Near Ir ◽

Ablation Study ◽

Pulse Energies

Abstract The surface of a titanium-based alloy Ti6Al4V was subjected to modifications by a near-IR femtosecond Ti:Sapphire laser, emitting at 775 nm pulses of 200 fs duration, in single-pulse and multi-pulse regimes, with up to 400 accumulated pulses, and pulse energies ranging from 2.5 to 250 $$\upmu $$ μ J. The whole range of induced effects is presented, from gentle ablation and pattern occurrence to substantial crater formation. Very observable laser-induced parallel periodic surface structures are reported, appearing both within the damage spot area, with low fluences, and at the peripheries of the craters, with higher fluences—but also on crater walls, and inside the crater structures. Damage threshold fluences $$({F}_{\mathrm{th}})$$ ( F th ) and the incubation factor $$(\zeta )$$ ( ζ ) were also determined. Graphic abstract

Download Full-text

F2-Laser Angle Nanomodification of PET

Materials Science Forum ◽

10.4028/www.scientific.net/msf.567-568.257 ◽

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.

Download Full-text

A planar chiral nanostructure with asymmetric transmission of linearly polarized wave and huge optical activity in near-infrared band

Chinese Physics B ◽

10.1088/1674-1056/22/12/124202 ◽

2013 ◽

Vol 22 (12) ◽

pp. 124202 ◽

Cited By ~ 8

Author(s):

Dao-Ya Liu ◽

Xiao-Yang Luo ◽

Jin-Jing Liu ◽

Jian-Feng Dong

Keyword(s):

Optical Activity ◽

Near Infrared ◽

Infrared Band ◽

Asymmetric Transmission ◽

Linearly Polarized

Download Full-text

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

Surfaces ◽

10.3390/surfaces2020021 ◽

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.

Download Full-text

Broadband Ultrathin Transmission Quarter Waveplate with Rectangular Hole Array Based on Plasmonic Resonances

Nanoscale Research Letters ◽

10.1186/s11671-019-3200-y ◽

2019 ◽

Vol 14 (1) ◽

Author(s):

Yu Wang ◽

Yumin Liu ◽

Jing Li ◽

Chang Liu ◽

Zhongyuan Yu ◽

...

Keyword(s):

Near Infrared ◽

Silver Film ◽

Band System ◽

Optical Systems ◽

Hole Array ◽

Rectangular Hole ◽

Infrared Band ◽

Large Size ◽

Narrow Bandwidth ◽

Linearly Polarized

AbstractThe control of the polarization states of light plays an important role in modern optical systems. However, traditional polarization manipulating devices often have narrow bandwidth and their large size makes it difficult for them to achieve miniaturization and integration of optical systems. This work presents an ultrathin quarter waveplate with a periodic silver film 2 × 2 rectangular hole array with a thickness less than λ/50. Numerical simulation shows that the waveplate can efficiently transform a circular polarized wave into a linearly polarized one at the center of 1550 nm, and its bandwidth is 525 nm. Furthermore, the quarter waveplate can efficiently invert linear polarization into circular polarization at 1550 nm, which ellipticity is near unit. With an array of small holes on a metal film to enhance transmission, this structure can increase the transmission to 0.44. The broadband quarter waveplate can be used in communication system and near infrared band system, and be integrated with other optical devices at nanoscale to achieve polarization operation, detection, and sensing.

Download Full-text

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

Advanced Optical Technologies ◽

10.1515/aot-2019-0062 ◽

2020 ◽

Vol 9 (1-2) ◽

pp. 11-39 ◽

Cited By ~ 3

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.

Download Full-text

Strain-Multiplexing Optical-Tuning based on Single-Pulsed Holographic Nanostructures

Nanoscale ◽

10.1039/d1nr01586a ◽

2021 ◽

Author(s):

Muhammad Waqas Khalid ◽

Rajib Ahmed ◽

Haider Butt

Keyword(s):

Data Storage ◽

Near Infrared ◽

Vital Role

Holographic flexible and rigid-nanostructures in the visible to near infrared plays a vital role in various applications including display, data storage, imaging, and security. However, personalized use of holography is...

Download Full-text