Speaker
Jean-Michel Guay
(University of Ottawa)
Description
We report the creation of angle independent colors on silver due to plasmonic effects arising from random nanoparticle distributions induced by picosecond laser exposure. The color is determined by the total accumulated fluence on the surface. This is valid for all combinations of laser parameters producing the same total accumulated fluence. Both spectral and extra-spectral colors can be obtained. Finite-difference time-domain computations carried out on a high-performance computing system identify the role of each geometrical parameter leading to understanding of color formation. Absorptive plasmonic resonances in heterogeneous nanoclusters are found to be key in the color formation. We also simultaneously report the angle-independent coloring of pure gold with colors covering the entire spectral and extra-spectral region. To our knowledge this represents a world first in the laser coloring of metals.
Author
Jean-Michel Guay
(University of Ottawa)
Co-authors
Dr
Antonino Calà Lesina
(University of Ottawa)
Dr
Arnaud Weck
(University of Ottawa)
Mr
Guillaume Cote
(University of Ottawa)
Dr
Lora Ramunno
(University of Ottawa)
Mr
Martin Charron
(University of Ottawa)
Dr
Pierre Berini
(University of Ottawa)
