FluorescÃncia induzida por plasmons superficiais em corantes

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

Plasmons, collective oscillations of conduction electrons, may have large influence on the optical properties of metallic microstructures and nanoestructures, and can be exploited in photonic devices. In this work, we produce metallic thin films by the method of evaporation at low pressure and characterized them by optical reflectivity measurements. The films were used to study the behavior of spontaneous emission (fluorescence) induced by surface plasmons in metal-dielectric interfaces. The physical system consisted of a dye dissolved in a polimeric matrix (pure or containing Ag or 2 TiO nanoparticles). Surface plasmons were excited by using the attenuated total reflection method (Kretschmann- Raether configuration) and measurements were performed to detect the fluorescence induced by the surface plasmons excitation. The fluorescence intensity and its spectral linewidth were analyzed as a function of the laser intensity. Evidence of line shape changes was observed due to the laser intensity, but the effect was very small because of the low power available

ASSUNTO(S)

plasmons superficiais amplificaÃÃo de plasmons superficiais surface plasmons amplification configuraÃÃo de kretschmann-raether metallic thin films fluorescÃncia emissÃo estimulada reflectance Ãptica directional laser emission emissÃo laser direcional optics fisica stimulated emission fluorescent dyes kretschmann-raether configuration filmes finos metÃlicos refletÃncia surface plasmons fluorescence corantes fluorescentes

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