Fabricación y Caracterización de Sustratos Plasmónicos Basados en Nanobastones de Oro

Abstract

Plasmonic devices were fabricated by controlled coverage of glass surfaces and gold thin films with gold nanorods. These nanostructured substrates have optical resonances in the visible and near infrared range of the electromagnetic
spectrum, and they produce large field enhancement, called hot spots, in highly localized regions of its surface. The control of these optical properties and the ability to tune the spectral response of a substrate are fundamental to design and to build ultrasensitive molecular sensors and probes for high resolution optical microscopy.
Gold nanorods were synthesized using seed mediated growth methods, with precise control of its final dimensions. Monodispersed colloids were obtained with high efficiency. Glass surfaces and gold thin films were chemically modified to adsorb gold nanorods. Surface coverage density was controlled through the immersion time of the substrates in the colloidal solution. Produced substrates were characterized by extinction spectra and electron microscopy images. Homogeneous coverages were obtained with absorption bands given by the coupling of the nanorods resonances with the substrate material.