Direct laser interference patterning of ophthalmic polydimethylsiloxane (PDMS) polymers

Sola, D.; Lavieja, Cristian; Orera, Alodia; Clemente, María J.

doi:10.1016/j.optlaseng.2018.03.007

Cited by 29 publications

(24 citation statements)

References 50 publications

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“…Only diffraction gratings inscribed inside the sample were optically characterized. All these samples showed diffraction patterns with diffraction angles according to the diffraction equation [42]. Intensities of zero and first diffracted orders were measured by using a power-meter to determine the 1st-order efficiency.…”

Section: Optical Characterizationmentioning

confidence: 99%

“…It is well known that the inscription of diffractive optical elements such as diffraction gratings can be used to modify the refractive index and hence the refractive power of an optical device by using short and ultrashort laser pulses with pulse energy below damage threshold [32][33][34][35]42,43]. In this work, we report on the fabrication of diffractive gratings in acrylic intra-ocular lenses by using high-repetition-rate ultrashort laser pulses.…”

Section: Introductionmentioning

confidence: 99%

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High-Repetition-Rate Femtosecond Laser Processing of Acrylic Intra-Ocular Lenses

Sola

Cases

2020

Polymers

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The study of laser processing of acrylic intra-ocular lenses (IOL) by using femtosecond laser pulses delivered at high-repetition rate is presented in this work. An ultra-compact air-cooled femtosecond diode laser (HighQ2-SHG, Spectra-Physics) delivering 250 fs laser pulses at the fixed wavelength of 520 nm with a repetition rate of 63 MHz was used to process the samples. Laser inscription of linear periodic patterns on the surface and inside the acrylic substrates was studied as a function of the processing parameters as well as the optical absorption characteristics of the sample. Scanning Electron Microscopy (SEM) Energy Dispersive X-ray Spectroscopy (EDX), and micro-Raman Spectroscopy were used to evaluate the compositional and microstructural changes induced by the laser radiation in the processed areas. Diffractive characterization was used to assess 1st-order efficiency and the refractive index change.

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Section: Optical Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High-Repetition-Rate Femtosecond Laser Processing of Acrylic Intra-Ocular Lenses

Sola

Cases

2020

Polymers

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“…A one-step method providing high-resolution and low-cost processing for patterning hot-embossing molds is Direct Laser Interference Patterning (DLIP) 31 , by which a wide variety of periodic ordered patterns can be fabricated on the surfaces of various materials, including metals 32 , 33 , ceramics 34 , 35 , and polymers 36 , 37 . In this method, an interference pattern is transferred onto the sample surface by overlapping two or more coherent laser beams.…”

Section: Introductionmentioning

confidence: 99%

Wettability control of polymeric microstructures replicated from laser-patterned stamps

Soldera

Wang

et al. 2020

Sci Rep

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In this study, two-step approaches to fabricate periodic microstructures on polyethylene terephthalate (PET) and poly(methyl methacrylate) (PMMA) substrates are presented to control the wettability of polymeric surfaces. Micropillar arrays with periods between 1.6 and 4.6 µm are patterned by plate-to-plate hot embossing using chromium stamps structured by four-beam Direct Laser Interference Patterning (DLIP). By varying the laser parameters, the shape, spatial period, and structure height of the laser-induced topography on Cr stamps are controlled. After that, the wettability properties, namely the static, advancing/receding contact angles (CAs), and contact angle hysteresis were characterized on the patterned PET and PMMA surfaces. The results indicate that the micropillar arrays induced a hydrophobic state in both polymers with CAs up to 140° in the case of PET, without modifying the surface chemistry. However, the structured surfaces show high adhesion to water, as the droplets stick to the surfaces and do not roll down even upon turning the substrates upside down. To investigate the wetting state on the structured polymers, theoretical CAs predicted by Wenzel and Cassie-Baxter models for selected structured samples with different topographical characteristics are also calculated and compared with the experimental data.

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“…Direct laser interference patterning (DLIP), a cost-effective one-step technique for texturing periodic microstructures with high resolution and throughput on a variety of materials [21,22,23], including metals [24,25,26,27], polymers [28,29] and ceramics [30,31], provides an efficient approach for molds patterning not only for hot embossing systems, but also for injection molding and UV nanoimprinting. In this method, an interference pattern generated by two or more coherently overlapping laser beams on the sample surface is employed to directly ablate the material at the intensity maxima positions producing periodic structures on its surface.…”

Section: Introductionmentioning

confidence: 99%

Picosecond Laser Interference Patterning of Periodical Micro-Architectures on Metallic Molds for Hot Embossing

Soldera

Wang

et al. 2019

Materials

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In this work, it is demonstrated that direct laser interference patterning (DLIP) is a method capable of producing microtextured metallic molds for hot embossing processes. Three different metals (Cr, Ni, and Cu), relevant for the mold production used in nanoimprinting systems, are patterned by DLIP using a picosecond laser source emitting at a 532 nm wavelength. The results show that the quality and surface topography of the produced hole-like micropatterns are determined by the laser processing parameters, such as irradiated energy density and the number of pulses. Laser-induced periodic surface structures (LIPSS) are also observed on the treated surfaces, whose shapes, periodicities, and orientations are strongly dependent on the accumulated fluence. Finally, the three structured metals are used as embossing molds to imprint microlenses on polymethyl methacrylate (PMMA) foils using an electrohydraulic press. Topographical profiles demonstrate that the obtained structures are comparable to the masters showing a satisfactory reproduction of the texture. The polymeric microlens arrays that showed the best surface homogeneity and overall quality were those embossed with the Cr molds.

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Direct laser interference patterning of ophthalmic polydimethylsiloxane (PDMS) polymers

Cited by 29 publications

References 50 publications

High-Repetition-Rate Femtosecond Laser Processing of Acrylic Intra-Ocular Lenses

High-Repetition-Rate Femtosecond Laser Processing of Acrylic Intra-Ocular Lenses

Wettability control of polymeric microstructures replicated from laser-patterned stamps

Picosecond Laser Interference Patterning of Periodical Micro-Architectures on Metallic Molds for Hot Embossing

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