Modelagem de efeitos plasmônicos em um metamaterial nanoestruturado para aplicação em sensoriamento óptico
Metamateriais are artificial media structured to obtain physical properties not readily found in nature. In general, these media are arranged periodically with a unit cell whose dimensions are smaller than the wavelength of the incident electromagnetic radiation. This characteristic allows dealin...
| Autor principal: | SILVA, Anderson Oliveira |
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| Grau: | Tese |
| Idioma: | por |
| Publicado em: |
Universidade Federal do Pará
2014
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| Assuntos: | |
| Acesso em linha: |
http://repositorio.ufpa.br/jspui/handle/2011/5912 |
| Resumo: |
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Metamateriais are artificial media structured to obtain physical properties not
readily found in nature. In general, these media are arranged periodically with a unit cell
whose dimensions are smaller than the wavelength of the incident electromagnetic
radiation. This characteristic allows dealing with such materiais as homogenized media,
which means describing them by effective constitutive parameters. This work performs
the analytical and numerical model of a metamaterial structured with metallic inclusions.
It is implemented a formalism based on the Maxwell-Garnett approach in order to
describe the effective refraction index of the metamaterial accounting for the geometry
of the nanoparticles and the nature of excited local field modes. It is shown that these
modes correspond to surface plasmon excitations. From the characterization of the
metamaterial at the optical domain, it is investigated the potential of such medium to the
construction of more compact refraction index sensors, with sensitivity values higher than
the ones typically found in systems based exclusively on optical fibers. |