EUROPEAN CONGRESS AND EXHIBITION ON ADVANCED MATERIALS AND PROCESSES - EUROMAT 2021

The fabrication of diffractive elements in ophthalmic polymers to induce refractive index changes to be applied for refractive correction is of great interest in the fields of optics and ophthalmology. In this work, poly-hydroxyethyl-methacrylate (PHEMA) and silicone hydrogel polymers used as soft contact lenses were structured with linear periodic patterns by means of Direct Laser...

Using UV-laser processing methods, multi-scaled micro/-nanostructured polycarbonate polymer surfaces were produced. The developed strategy includes the utilization of the Direct Laser Interference Patterning (DLIP) method for creating grating and pillar-like geometries in the microscale as well as the fabrication of Laser-induced Periodic Surface Structures (LIPSS) with features sizes of a few...

Femtosecond laser-induced element redistribution in glass [1] has been demonstrated as a powerful technique to fabricate photonic devices, such as waveguides [2], tapers [3], optical amplifiers and lasers [4]. A key feature of this approach is that the glass composition can be fine-tuned by adding small amounts of modifiers act as refractive index carriers (typically La2O3 or BaO) and other...

All-purpose polymers are extensively used in many applications fields such as packaging, biomaterials, microelectronic devices and thin-film technology due to their combination of low-density, flexibility, ease of processing and low processing costs [1]. Many novel processing strategies to control the wettability characteristics of polymeric surfaces have been devised in the last years,...

Indium tin oxide (ITO) is a transparent conductive oxide frequently used as electrode in numerous optoelectronic devices, such as thin film solar cells, organic LEDs and touch panels, as well as in gas and humidity sensors [1,2]. Surface microtexturing on ITO can be beneficial for enhancing the light trapping effect in solar cells, for improving the light outcoupling of OLEDs or for...

The objective of the present study is to observe the microstructural modifications from equiatomic simple mixture with finer Ni (oxyreduction) and coarse Ti HDH (hydration-dehydration) elemental powders as green bodies pressed when reactive sintering occurs using a Yb:fiber laser source. Processing was done using a Yb:fiber laser with 2 mm diameter, in order to evaluate the reaction...

The fabrication of diffraction gratings by ultrashort direct laser writing in poly-hydroxyethyl-methacrylate (PHEMA) polymers used as soft contact lenses is reported. Diffraction gratings were inscribed by focusing laser radiation 100 µm underneath the surface of the samples. Low- and high-repetition rate Ti:sapphire lasers with 120 fs pulsewidth working at 1 kHz and 80 MHz respectively were...