"Light at the nanoscale"

SANTILLÁN, JESICA MARÍA JOSÉ

Ciudad Autónoma de Buenos Aires

Otro; XVII GIAMBIAGI WINTER SCHOOL: "LIGHT AND LIGHT BASED TECHNOLOGIES"; 2015

Departamento de Física "J. J. Giambiagi" de la Facultad de Ciencias Exactas y Naturales (FCEyN) de la Universidad Nacional de Buenos Aires (UBA)

The interaction between electromagnetic radiation and free electrons in small metallic nanostructures or metal-dielectric interfaces of the order or less than the wavelength of light is governed by the type of metal, geometry, structure, size, wavelength and the surrounding medium. The behavior can be interpreted based on the existence of "plasmons" whose uniquefeatures make a "fingerprint" for each metal and can be appropriately used for metal nanoparticles sizing. It can also be used to determine the type of structures that nanoparticle presents: simple (bare core) and more complex spherical core-shell structures (metal-metal oxide or metal-dielectric). Applied results to the characterization of nickel, copper and silver colloidal suspensions generated by femtosecond laser ablation using the technique of optical extinction spectroscopy are presented, together with the theoretical design of a isolated silver particle sensor.