Waveplates modify polarization by generating a phase change. Laser Induced Periodic Surface Structures (LIPSS) have recently started to be studied as waveplates due to the birefringence in-duced by the nanoripples, easily fabricated in a one-step process by laser, where LIPSS morphology is defined by the characteristics of the laser process parameters and the substrate material. The optical properties of these waveplates are defined by LIPSS parameters such as period, depth or width of the ripples. In this work we have deposited thin film coatings on stainless steel samples containing LIPSS for different coating thickness and composition. Results show that thin film coatings are a good candidate for the tunability of LIPSS birefringence since the coating modifies the induced polarization change and reflectivity of the sample depending on coating thickness and composition, as expected from numerical simulations.
Laser interference lithography (LIL) is concerned with the use of interference patterns generated from two or several
coherent beams of laser radiation for the structuring of materials. This paper presents the work on the processes based on
resists and direct writing with laser interference lithography. In the work, a four-beam laser interference system was used
as a submicrometer structuring tool in which a high-energy pulsed, frequency-tripled and TM polarized Nd:YAG laser (355 nm) with a coherent length of 3 m, energy power up to 320 mJ/cm2, pulse duration of 8 ns and 10 Hz repetition rate was used as a light source. The experimental results were achieved with 2-beam and 4-beam interference patterning. The processes can be used to define submicron surface relieves in large areas for use in the field of MEMS.
The tailoring of the properties of silver nanoscale structures is of great interest to fields such as nanosensing and
biophotonics. Because of this, much effort is devoted to the development of new growth methods of silver
nanostructures. In this work, a fabrication process for two dimensional silver structures by infiltrating self-assembled
polystyrene spheres is presented. Additionally, the structural and optical characterizations of the fabricated structures are
studied.
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