Plasmones de superficie localizados en sistemas metálicos Nanoestructurados.

Abstract

The nanostructured metal systems of Au and Ag have unique plasma prop erties of interest in molecular detection pro cesses by the Raman sp ectroscopy technique. In particular, the present work studied Ag and Au metal fim systems on ordered arrays of p olymer nanospheres . For the study simulations were made by the fiite element metho d using the COMSOL Multiphysics software to demonstrate the confiement and spatial distribution of the electric fild on the nanostructured surface; likewise, identify resonant plasma mo des in the 400-1000 nm sp ectral range and compare them with exp erimental measurements of optical reflctivity. Once the simulation was validated, several studies were carried out, which consist of analyzing the b ehavior of the plasm´onica resp onse of these systems through optical reflctivity and for this we proceeded to vary physical parameters such as, for example: p olarization of incident light, angle of incidence of light, angle of rotation of the sample and sample dimensions. The pap er also presents the comparison of these nanostructured systems, with Ag and Au fims. Finally, these results seek to demonstrate the s uitability of using one substrate or another, through the characterization of plasmon engineering in AgFON and AuFON (Film Over Nanosphere) systems.