Speaker
Description
Silicate glasses are commonly used materials in numerous application fields, such as microelectronics, photovoltaics, optical components, and biomedical devices due to their outstanding combination of mechanical, optical, thermal, and chemical properties [1,2]. Functionalization through nano/micropatterning can provide new or enhanced surface properties, expanding the applicability of such engineered glasses into new technical areas [3]. Laser structuring methods are nowadays relevant tools employed to process absorbing materials in lab and industrial scale. However, the processability of materials which are transparent to the used laser wavelength has not been intensively studied, especially for producing structures with feature sizes on the order of the µm. Here, Direct Laser Interference Patterning (DLIP) was used to structure and functionalize soda-lime glass substrates through non-lineal absorption with visible ps-pulsed laser radiation. Overlapping two and four coherent beams, periodic line- and dot-like patterns, respectively, were fabricated with periods between 2.3 and 9.0 µm and aspect ratios up to 0.3. Additionally, laser-induced periodic surface structures (LIPSS) with lateral sizes around 300 nm were identified in the microstructures. The nano/microstructured surfaces presented significantly modified properties. For instance, all the laser-treated surfaces had an increased hydrophilic behavior and for some cases, the texture enabled a super-hydrophilic state, spreading the water droplet all over the textured surface. In addition, the periodic micropatterns acted as relief diffraction gratings, splitting the incident light into multiple diffraction modes in transmission and reflection mode. The DLIP process parameters were explored to produce high-quality textures with super-hydrophilic properties and diffraction efficiencies above 30%.
References
[1] Ottevaere H et al. J. Opt. A: Pure Appl. Opt. 8 S407–29 (2006).
[2] Ainslie K et al. Lab Chip 8 1864–78 (2008).
[3] Coltro W et al. Lab Chip 7 931–4 (2007).
| Speaker Country | Germany |
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