Repositório Digital

A- A A+

Anisotropic effective medium properties from interacting Ag nanoparticles in silicon dioxide

.

Anisotropic effective medium properties from interacting Ag nanoparticles in silicon dioxide

Mostrar registro completo

Estatísticas

Título Anisotropic effective medium properties from interacting Ag nanoparticles in silicon dioxide
Autor Menegotto, Thiago
Horowitz, Flavio
Abstract Films containing a layer of Ag nanoparticles embedded in silicon dioxide were produced by RF magnetron sputtering. Optical transmittance measurements at several angles of incidence (from normal to 75°) revealed two surface plasmon resonance (SPR) peaks, which depend on electric field direction: one in the ultraviolet and another red-shifted from the dilute Ag∕SiO2 system resonance at 410 nm. In order to investigate the origin of this anisotropic behavior, the structural properties were determined by transmission electron microscopy, revealing the bidimensional plane distribution of Ag nanoparticles with nearly spherical shape as well as the filling factor of metal in the composite. A simple model linked to these experimental parameters allowed description of the most relevant features of the SPR positions, which, depending on the field direction, were distinctly affected by the coupling of oscillations between close nanoparticles, as described by a modified Drude–Lorentz dielectric function introduced into the Maxwell–Garnett relation. This approach allowed prediction of the resonance for light at 75° incidence from the SPR position for light at normal incidence, in good agreement with experimental observation.
Contido em Applied optics (2004). Washington, DC. Vol. 53, no. 13 (Mar. 2014), p. 2853-2859
Assunto Dióxido de silício
Filmes finos
Nanoparticulas
Plasmas de superfície
Prata
Propriedades oticas
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/107184
Arquivos Descrição Formato
000919387.pdf (615.1Kb) Texto completo (inglês) Adobe PDF Visualizar/abrir

Este item está licenciado na Creative Commons License

Este item aparece na(s) seguinte(s) coleção(ões)


Mostrar registro completo

Percorrer



  • O autor é titular dos direitos autorais dos documentos disponíveis neste repositório e é vedada, nos termos da lei, a comercialização de qualquer espécie sem sua autorização prévia.
    Projeto gráfico elaborado pelo Caixola - Clube de Criação Fabico/UFRGS Powered by DSpace software, Version 1.8.1.