Liquid assisted ablation of zirconium for the growth of LIPSS at varying pulse durations and pulse energies by femtosecond laser irradiation

Bashir, Shazia; Rafique, Muhammad; Husinsky, W.

doi:10.1016/j.nimb.2015.02.017

Cited by 19 publications

(9 citation statements)

References 53 publications

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“…Laser exposure (the number of incident pulses per spot, N ) is known to influence LIPSS (both ripples and nanoripples 36 ) to much less extent, inducing about 30% reduction in their periods versus exposures, increasing to N ∼ 10 2 -10 329-31 . Other effects -angle of incidence/laser polarization 38 , intact dielectric [39][40][41] indicate some emerging possibilities in reduction of LIPSS periods, but should be explored in details yet. Meanwhile, nanoscale hydrodynamics instabilities of laser-induced surface melt were also considered and explored as an alternative to the diverse electromagnetic approaches 28,42,43 .…”

Section: Introductionmentioning

confidence: 99%

Ultrafast photoionization and excitation of surface-plasmon-polaritons on diamond surfaces

Apostolova

Obreshkov

Ионин

et al. 2018

Applied Surface Science

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Ultrafast plasmonics of novel materials has emerged as a promising field of nanophotonics bringing new concepts for advanced optical applications. Ultrafast electronic photoexcitation of a diamond surface and subsequent surface plasmon-polaritons (SPPs) excitation are studied both theoretically and experimentally -for the first time. After photoexcitation on the rising edge of the pulse, transient surface metallization was found to occur for laser intensity near 18 TW/cm 2 due to enhancement of the impact ionization rate; in this regime, the dielectric constant of the photoexcited diamond becomes negative in the trailing edge of the pulse thereby increasing the efficacy with which surface roughness leads to inhomogeneous energy absorption at the SPP wave-vector. These transient SPP waves imprint permanent fine and coarse surface ripples oriented perpendicularly to the laser polarization. The theoretical modeling is supported by the experiments on the generation of laser-induced periodic surface structure on diamond surface with normally incident 515-nm, 200-fs laser pulses. Sub-wavelength (Λ ≈ 100 nm) and near wavelength (Λ ≈ 450 nm) surface ripples oriented perpendicularly to the laser polarization emerged within the ablative craters with the increased number of laser shots; the spatial periods of the surface ripples decreased moderately with the increasing exposure. The comparison between experimental data and theoretical predictions demonstrates the role of transient changes of the dielectric permittivity of diamond during the initial stage of periodic surface ripple formation upon irradiation with ultrashort laser pulses.

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Section: Introductionmentioning

confidence: 99%

Ultrafast photoionization and excitation of surface-plasmon-polaritons on diamond surfaces

Apostolova

Obreshkov

Ионин

et al. 2018

Applied Surface Science

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“…CO 2 laser, Nd: YAG laser and Er: YAG laser irradiation), which is termed as 'cold working' without a heat effect [15,16,27]. The ceramic is gasified by the femtosecond laser irradiation due to large amount of energy and plasma generated by the Coulomb explosion [28][29][30][31]. The laser confocal microscope and SEM indicated that regular microgrooves were evenly distributed on the surface of zirconia after femtosecond laser processing.…”

Section: Discussionmentioning

confidence: 99%

Effect of femtosecond laser and silica coating on the bond strength of zirconia ceramic

Zhou

Chen

Cheng

et al. 2020

Advances in Applied Ceramics

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Reasonable zirconia surface pretreatment results in excellent bond strength. This study compared the effects of different surface treatments on the shear bond strength of zirconia. A total of 48 zirconia discs were divided into six separate groups (n = 8) including a Control (CL), Alumina particle blasting (AP), Silica coating (SC), Alumina particle blasting and silica coating (AS), Femtosecond laser (FL) and Femtosecond laser and silica coating (FS) group. Resin block was bound with zirconia using resin cement after performing different surface processing. Shear bond strength (SBS) was measured using a universal testing machine with a crosshead speed of 1 mm min -1 and analysed through one-way analysis of variance (ANOVA)/Tukey tests. SEM revealed many regular microgrooves structured on the surface by laser irradiation. Some nano-columns and nano-holes were found on the side walls of the groove. SBS test results showed that pretreatment of the femtosecond laser and the conjunctive use of a femtosecond laser and silica coating significantly improved SBS (13.769 ± 1.570 MPa and 13.516 ± 1.759 MPa) between zirconia and resin. Owing to limitations of this study, regular microgrooves were structured on zirconia surfaces using femtosecond laser treatment. SBS values of zirconia were significantly improved after femtosecond laser processing and the use of femtosecond laser and silica coating. The influence of surface roughness on the adhesion between zirconia and resin cement was seem more effectively observed in this study.

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“…The interaction of laser radiations with solid materials, accompanied by a variety of instabilities, may result in the formation of various surface features, for example, laser-induced periodic surface structures (LIPSSs), cracks, nanodots, nanopores or nanocavities, and grains [7,8].…”

Section: Introductionmentioning

confidence: 99%

“…Nanofabrication based on laser ablation strongly depends on parameters of laser beam, such as number of pulses, pulse duration, wavelength, fluence, and material's nature as well as the environmental conditions and their nanochemical effects [8]. With increasing number of pulses, the incubation effects become dominant, causing the reduction in ablation threshold of the irradiated material.…”

Section: Introductionmentioning

confidence: 99%

“…Various kinds of structures can be grown due to the viscous flow of the vapors of the surrounding liquid and its chemical reaction with the metals. Shock wave generation, confinement and shielding effects, different cooling and quenching rates, and different chemical reactivity of the environment significantly affects the ablation efficiency of the target material [1,8] without momentous effect on the stoichiometry of the target, and results in the development of cavitation bubbles and colloids owing to the formation of metal alcohols and oxides. Several physical processes such as formation of plasma, condensation, agglomeration, nucleation and coalescence are accountable for the formation and growth of nanostructures in the presence of reactive environment [10].…”

Section: Introductionmentioning

confidence: 99%

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Structural Modifications of KrF Excimer Laser-Ablated Zirconium Correlated to the Surface and Mechanical Properties

Ali¹,

Umm-i-Kalsoom²,

Bashir³

et al. 2017

Laser Ablation - From Fundamentals to Applications

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The structural modifications of KrF excimer laser-ablated zirconium (Zr) have been investigated in correlation with its surface and mechanical properties after ablation in deionized water and ethanol. KrF excimer laser of pulse duration of 20 ns, wavelength of 248 nm, and repetition rate of 20 Hz has been utilized for this purpose. Irradiation of Zr was carried out for varying number of laser pulses ranging from 500 to 2000 for laser fluence value of 3.6 J/cm 2 . The structural and chemical analyses were performed by using X-ray diffraction (XRD), Raman spectroscopy, and energy dispersive X-ray spectroscopy (EDS) techniques. Scanning electron microscope (SEM) and Vickers hardness tester were utilized for the analysis of surface morphology and hardness of laser-irradiated Zr targets. Presence of surrounding liquids played substantial role in structural, chemical, and mechanical modifications of Zr targets after irradiation. Pressure gradients and convective bubble motion owing to the confinement effects of the surrounding liquids, several thermal and chemical phenomena produced by heating through laser at the solid-liquid interface results in the generation of various hydrides and oxides of Zr, which are responsible for the development of various surface features and increase in hardness of irradiated Zr.

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Liquid assisted ablation of zirconium for the growth of LIPSS at varying pulse durations and pulse energies by femtosecond laser irradiation

Cited by 19 publications

References 53 publications

Ultrafast photoionization and excitation of surface-plasmon-polaritons on diamond surfaces

Ultrafast photoionization and excitation of surface-plasmon-polaritons on diamond surfaces

Effect of femtosecond laser and silica coating on the bond strength of zirconia ceramic

Structural Modifications of KrF Excimer Laser-Ablated Zirconium Correlated to the Surface and Mechanical Properties

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