Brief description and aims of work
The Spanish National Research Council (CSIC) is the largest public research institution of Spain and the third largest in Europe. The CSIC team is composed of members of the Laser Processing Group (LPG) at the Institute of Optics of the CSIC. The LPG has more than 25 years experience in laser-matter interaction, particularly in the study of ultrafast interactions dynamics and materials processing with ultrafast lasers. Presently its research activity focuses on the fields of nano- and ultrafast science, employing numerous laser structuring strategies aimed at achieving large area, homogeneous nanostructures in metals, semiconductors, dielectrics and polymers. These include coherent extension of laser induced periodic surface structures (LIPSS), shaping and alignment of nanoparticles, advanced colloidal lithography exploiting optical near-fields, as well as optimizing surface processing via temporal pulse shaping. The CSIC team has demonstrated recently high speed inscription of uniform, large-area, self-organized, LIPSS structures in Chromium films using a high repetition rate femtosecond laser (Optics Letters 39, 2491 (2014)). Highly regular 3 cm x 3 cm optical gratings with a period of 0.9 µm and a relative diffraction efficiency of 42% (see below) can be fabricated within less than 6 minutes. The CSIC team is leading the LiNaBioFluid workpackage dedicated to laser-based fabrication of large-area biomimetic surface structures in different materials, featuring enhanced fluid transport. These structures will be eventually employed to build a low-friction demonstrator device for industrial applications.
Fig. 1. (a) Color photograph of a laser-fabricated diffraction grating in a Cr film exploiting self-organization processes. (b) Optical micrograph of a zoomed region. The double-headed arrow indicates the laser polarization (E-vector) direction. The inset in (b) shows the 2D FFT image of the micrograph. Taken from A. Ruiz de la Cruz et al., “High speed inscription of uniform, large-area laser-induced periodic surface structures in Cr films using a high repetition rate fs laser”, Optics Letters 39, 2491 (2014).
Laser Processing Group, Instituto de Optica, CSIC, Serrano 121, 28006 Madrid, Spain