INFLUENCE OF THE SUBSTRATE ON THE OPTICAL PROPERTIES OF A Au NANOPARTICLE WITH COMPLEX SHAPE

EDUARDO M. PERASSI; CALIN HRELESCU; ANDREAS WISNET; MARKUS DÖBLINGER; CHRISTINA SCHEU; FRANK JÄCKEL; EDUARDO A. CORONADO; JOCHEN FELDMANN

Montevideo

Congreso; 2ª Reunión Conjunta SUF-AFA; 2011

Sociedad Uruguaya de Física y Asociación de Física Argentina

The optical properties of noble metal nanoparticles(NPs) have been  demonstrated to have extensive applications in  many different  fields, like ultrasensitive spectroscopies, photonics, imaging, biosensors, cancer therapy.  These optical properties are determined by the collective excitation of conduction electrons, known as localized surface plasmon, which are highly dependent of the NP size and shape as well as of the optical properties of the medium around the NP. Therefore, a rigorous understanding of these localized plasmon needs a rigorous characterizations  of  the  NP  shape  as  well  as  of  a  correct  characterization  of  the  medium  around  the  NP.  In  this  work  we  have  determined  the  far  field  optical  properties  of  a  single complex NP by measuring Raylegh scattering at different incident polarizations using a dark­field optical microscope and then we were able to reconstruct its 3D complex shape. Using the 3D morphology we have performed preliminary electrodynamic simulations and compared it with the measured Rayleigh scattering.