Direct laser interference patterning of poly(3,4-ethylene dioxythiophene)-poly(styrene sulfonate) (PEDOT-PSS) thin films

2009 ◽  
Vol 255 (22) ◽  
pp. 9186-9192 ◽  
Author(s):  
Andrés F. Lasagni ◽  
Jeffrey L. Hendricks ◽  
Charles M. Shaw ◽  
Dajun Yuan ◽  
David C. Martin ◽  
...  
Keyword(s):  
Thin Films ◽  
Laser Interference ◽  
Styrene Sulfonate ◽  
Direct Laser ◽  
Poly Styrene Sulfonate ◽  
Direct Laser Interference Patterning

scholarly journals Enhancement of Gas Sensing Response on WO3 Thin Films Processed by Direct Laser Interference Patterning

Proceedings ◽  
2019 ◽  
Vol 2 (13) ◽  
pp. 813
Author(s):  
Parellada-Monreal ◽  
Martínez-Calderón ◽  
Castro-Hurtado ◽  
Olaizola ◽  
Zonta ◽  
...  
Keyword(s):  
Thin Films ◽  
Surface Morphology ◽  
Physical Properties ◽  
Gas Sensing ◽  
Laser Beams ◽  
Line Pattern ◽  
Laser Interference ◽  
Direct Laser ◽  
Direct Laser Interference Patterning ◽  
Wo3 Thin Films

Direct Laser Interference Patterning (DLIP) technique has been used to generate a line pattern on the surface of WO3 thin films, due to the interference of two coherent laser beams, modifying its surface morphology and physical properties. Gas sensing devices based on WO3 thin films annealed at 600 °C and nanostructured by DLIP have been fabricated and compared to samples simply annealed at the same temperature. The sensors processed by DLIP present a great enhancement on the response in NO2 atmospheres indicating possible modifications on the composition, aside from the morphological one.

scholarly journals Controlling the magnetic structure of Co/Pd thin films by direct laser interference patterning

2015 ◽  
Vol 26 (20) ◽  
pp. 205302 ◽  
Author(s):  
Martin Stärk ◽  
Frank Schlickeiser ◽  
Dennis Nissen ◽  
Birgit Hebler ◽  
Philipp Graus ◽  
...  
Keyword(s):  
Thin Films ◽  
Magnetic Structure ◽  
Laser Interference ◽  
Direct Laser ◽  
Direct Laser Interference Patterning

In-Depth Investigation of Copper Surface Chemistry Modification by Ultrashort Pulsed Direct Laser Interference Patterning

Langmuir ◽  
2020 ◽  
Vol 36 (45) ◽  
pp. 13415-13425 ◽  
Author(s):  
Daniel W. Müller ◽  
Anne Holtsch ◽  
Sarah Lößlein ◽  
Christoph Pauly ◽  
Christian Spengler ◽  
...  
Keyword(s):  
Surface Chemistry ◽  
Copper Surface ◽  
Laser Interference ◽  
Direct Laser ◽  
Surface Chemistry Modification ◽  
Direct Laser Interference Patterning

scholarly journals Direct Laser Interference Patterning of Diffraction Gratings in Safrofilcon-A Hydrogel: Fabrication and Hydration Assessment

Polymers ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 679
Author(s):  
Daniel Sola ◽  
Stephan Milles ◽  
Andrés F. Lasagni
Keyword(s):  
Laser Fluence ◽  
Contact Lenses ◽  
Laser Source ◽  
Spatial Period ◽  
Laser Interference ◽  
Periodic Patterns ◽  
Hydration Properties ◽  
Water Contact ◽  
Direct Laser ◽  
Direct Laser Interference Patterning

Refractive index modification by laser micro-structuration of diffractive optical devices in ophthalmic polymers has recently been applied for refractive correction in the fields of optics and ophthalmology. In this work, Safrofilcon-A hydrogel, used as soft contact lenses, was processed by direct laser interference patterning (DLIP) to fabricate linear periodic patterns on the surface of the samples. Periodic modulation of the surface was attained under two-beam interference by using a Q-switched laser source with emission at 263 nm and 4 ns pulse duration. Features of processed areas were studied as a function of both the interference spatial period and the laser fluence. Optical confocal microscopy used to evaluate the topography of the processed samples showed that both structured height and surface roughness increased with laser fluence. Static water contact angle (WCA) measurements were carried out with deionized water droplets on the structured areas to evaluate the hydration properties of DLIP structures. It was observed that the laser structured areas induced a delay in the hydration process. Finally, microstructural changes induced in the structured areas were assessed by confocal micro-Raman spectroscopy showing that at low laser fluences the polymer structure remained almost unaltered. In addition, Raman spectra of hydrated samples recovered the original shape of areas structured at low laser fluence.

scholarly journals Improving Throughput and Microstructure Uniformity in Direct Laser Interference Patterning Utilizing Top-Hat Shaped Beams

2021 ◽  
Author(s):  
Mikhael El-Khoury ◽  
Bogdan Voisiat ◽  
Tim Kunze ◽  
Andrés Fabián Lasagni
Keyword(s):  
Intensity Distribution ◽  
Laser Interference ◽  
Gaussian Laser Beam ◽  
Laser Beam Intensity ◽  
Direct Laser ◽  
Standard Configuration ◽  
Laser Sources ◽  
Periodic Microstructures ◽  
Direct Laser Interference Patterning ◽  
The Impact

Abstract Uniform periodic microstructures formation over large areas is generally challenging in Direct Laser Interference Patterning (DLIP) due to the Gaussian laser beam intensity distribution inherent to most commercial laser sources. In this work, a diffractive fundamental beam-mode shaper (FBS) element is implemented in a four-beam DLIP optical setup to generate a square-shaped top-hat intensity distribution in the interference volume. The interference patterns produced by a standard configuration and the developed setup are measured and compared. In particular, the impact of both laser intensity distributions on process throughput as well as fill-factor is investigated by measuring the resulting microstructure height with height error over the structured surface. It is demonstrated that by utilizing top-hat-shaped interference patterns, it is possible to produce on average 44.8 % deeper structures with up to 60 % higher homogeneity at the same throughput. Moreover, the presented approach allows the production of microstructures with comparable height and homogeneity compared to the Gaussian intensity distribution with increased throughput of 53%.

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