Seminarios en el Acelerador - Efecto de irradiación con iones pesados en nanopartículas plasmónicas
20.06.2013 - 20.06.2013
CMAM - Madrid
Seminarios informales en el Acelerador


Ponente: Ovidio Y. Peña Rodríguez, Instituto de Fusión Nucñear, UPM

Titulo: Efecto de irradiación con iones pesados en nanopartículas plasmónicas

Abstract: Metallic nanoparticles (NPs) have unique optical properties that make them suitable for a wide range of prospective applications. For example, large third-order susceptibility and optical response times of the order of picoseconds make them excellent candidates for use in different fields such as catalysis[1], optoelectronics[2] and biomedical diagnosis using dark field light microscopy[3]. However, researchers still have a long way to go before they can fully develop their potential applications, because it is necessary to control their optical behavior, which is often done by varying parameters like shape, size and composition[4]. Non-spherical nanoparticles are a good example of how one can control the optical behavior by tuning the Surface Plasmon Resonance (SPR) associated with the presence of NPs[5,6]. By means of a low-fluence irradiation (1012-1013 cm-2) with swift heavy ions the metallic nanoparticles embedded in dielectric matrices can be transformed into prolate spheroids, whose larger axis is aligned with the incident ion beam direction. For instance, the deformation of metallic nanoparticles has been reported before for cobalt NPs implanted in SiO2 and irradiated with iodine[7], for gold NPs implanted in planar SiO2 films after irradiation with Si[8] and Cu[9] ions and, more recently, for Pt NPs formed by ion-beam synthesis in amorphous SiO2 irradiated with Au ions[10]. However, despite all the work that has been done on this issue, this topic is far from being exhausted. For instance, the mechanisms that induce the deformation are not completely clear. In this talk we will make a quick review of the state of the art in this field and discuss some recent results, together with potential applications of these elongated nanoparticles.


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El seminario tendrá lugar en la sala de reuniones del CMAM