Formation mechanism of self-organized nano-ripples on quartz surface using femtosecond laser pulses

Ahsan, Md. Shamim; Lee, Man Seop; Hasan, Mohammad Khairul; Noh, Young‐Chul; Sohn, Ik-Bu; Ahmed, Farid; Jun, Martin B. G.

doi:10.1016/j.ijleo.2015.08.107

Cited by 6 publications

(5 citation statements)

References 27 publications

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“…The morphology of the irradiated positions could be controlled by means of the applied fluence F and number of pulses N. Preliminary experiments were performed to determine parameter sets to generate rippled dots and holes. These results showed that smooth crater forms after N < 5 pulses, ripples occur after N = 5-10 pulses, and holes form after N > 10 pulses, which was also observed in several other studies [26,34,35]. Chippings were observed at F ≥ 3.4 J/cm 2 , thus, the fluence was set just below this value to F = 2.6 J/cm 2 to maximize the modified area.…”

Section: Methodssupporting

confidence: 85%

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Transparent laser-structured glasses with superhydrophilic properties for anti-fogging applications

et al. 2019

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Ultrashort pulse laser structuring enables direct modification of glass surfaces to generate superhydrophilic properties for anti-fogging applications. This approach makes coatings dispensable and the generated surfaces remain thermally, mechanically, and chemically resistant. However, the laser-generated structures usually cause scattering, which decreases transmission and may disturb the vision through the modified glass in the dry state. The aim of this study was to find a laser-processing strategy to achieve superhydrophilic, anti-fogging properties on glass surfaces with maximum transmission and minimal visual perception of the generated structure. For this purpose, we used an ultrashort-pulsed laser to generate periodic patterns of rippled circles or rough holes with varying pitch. The water contact angle and transmission of the structured glasses were measured as a function of the structured area. It was found that a periodic pattern of holes, which covers less than 1% of the surface, is already sufficient to reach the superhydrophilic state (contact angle < 5°) and provides nearly the same transmission as pristine glass. Pictures of objects imaged through dry, structured glasses, which were placed close to the lens or object, showed in both cases only a minimal decrease of contrast. If this minor drawback can be accepted, this direct laser structuring approach could be an interesting alternative to coating-based techniques and leaves even room to apply additional coatings for the fabrication of multi-functional special glasses.

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Section: Methodssupporting

confidence: 85%

“…Reasons could be that these surfaces are either perfectly transparent or that this issue has often been neglected. Because laser structuring typically causes scattering on optical surfaces [19,34,39,40], we focused here on evaluating their visual perception in the dry state ( Fig. 6).…”

Section: Discussionmentioning

confidence: 99%

Transparent laser-structured glasses with superhydrophilic properties for anti-fogging applications

et al. 2019

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“…Besides, the interaction of USP with the material gives rise to laser-induced periodic surface structures (LIPSS), which were recently observed in transparent ceramic materials like fused silica [ 51 ], quartz [ 52 ], sapphire [ 53 , 54 ], soda-lime-silicate, and borosilicate glasses [ 55 ]. Although the micro-texturing based on LIPSS is a relatively simple process, features with high aspect ratios are hard to achieve and their periodicity is mainly dictated by the used radiation wavelength and its polarization state [ 56 ].…”

Section: Introductionmentioning

confidence: 99%

Microfabrication and Surface Functionalization of Soda Lime Glass through Direct Laser Interference Patterning

et al. 2021

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All-purpose glasses are common in many established and emerging industries, such as microelectronics, photovoltaics, optical components, and biomedical devices due to their outstanding combination of mechanical, optical, thermal, and chemical properties. Surface functionalization through nano/micropatterning can further enhance glasses’ surface properties, expanding their applicability into new fields. Although laser structuring methods have been successfully employed on many absorbing materials, the processability of transparent materials with visible laser radiation has not been intensively studied, especially for producing structures smaller than 10 µm. Here, interference-based optical setups are used to directly pattern soda lime substrates through non-lineal absorption with ps-pulsed laser radiation in the visible spectrum. Line- and dot-like patterns are fabricated with spatial periods between 2.3 and 9.0 µm and aspect ratios up to 0.29. Furthermore, laser-induced periodic surface structures (LIPSS) with a feature size of approximately 300 nm are visible within these microstructures. The textured surfaces show significantly modified properties. Namely, the treated surfaces have an increased hydrophilic behavior, even reaching a super-hydrophilic state for some cases. In addition, the micropatterns act as relief diffraction gratings, which split incident light into diffraction modes. The process parameters were optimized to produce high-quality textures with super-hydrophilic properties and diffraction efficiencies above 30%.

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“…A femtosecond laser (Spitfire Ace-35F, Spectra-Physics, USA) was focused on the surface of the crystalline silicon through a cylindrical lens ( f = 50 mm), and the initial circular focal spot was shaped into a linear focal spot (long axis length: 5 mm, short axis length: 10 μm) to improve the fabrication efficiency. Because of the relationship between the LIPSS period and the laser wavelength and pulse width, , the femtosecond laser wavelength and pulse width being set to 800 nm and 50 fs fabricated an SGTP with a period slightly smaller than 800 nm and thus high diffraction resolution. The laser fluence and scanning speed were set to 0.17 J cm –2 and 2 mm s –1 , respectively.…”

Section: Materials and Methodsmentioning

confidence: 99%

High-Uniformity Submicron Gratings with Tunable Periods Fabricated through Femtosecond Laser-Assisted Molding Technology for Deformation Detection

Liu

Huang

et al. 2022

ACS Appl. Mater. Interfaces

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As one of the important diffractive optical elements, the submicron gratings on flexible substrates can actively and precisely control the dispersion and steering characteristics of beams and have been widely applied in deformation detection technologies. Herein, we propose a spatially modulated femtosecond laser-assisted molding technology for efficiently fabricating high-uniformity large-area submicron gratings with tunable periods on flexible substrates. The technology first uses a cylindrically focused femtosecond laser-assisted chemical etching method to form a regular submicron grating on silicon; subsequently, the structure is cast with polydimethylsiloxane, a useful flexible substrate with a small Young’s modulus, and cured to obtain a high-uniformity large-area submicron grating with a tunable period. The grating exhibits high mechanical stability and sensitivity and favorable optical properties. In the present study, as the deformation of the grating increased from 0 to 10%, the diffraction angle changed by 6.5°. Under illumination by a broad-band white-light source, distinguishable multicolor diffraction patterns were clearly observed. Drawing on this characteristic, we fabricated a deformation sensor. The grating fabricated by using the proposed technology also has potential applications in optical sensors and soft robots.

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Formation mechanism of self-organized nano-ripples on quartz surface using femtosecond laser pulses

Cited by 6 publications

References 27 publications

Transparent laser-structured glasses with superhydrophilic properties for anti-fogging applications

Transparent laser-structured glasses with superhydrophilic properties for anti-fogging applications

Microfabrication and Surface Functionalization of Soda Lime Glass through Direct Laser Interference Patterning

High-Uniformity Submicron Gratings with Tunable Periods Fabricated through Femtosecond Laser-Assisted Molding Technology for Deformation Detection

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