OBTENCION, CHARACTERIZATION AND APPLICATIONS OF OPTICAL DEVICES BASED ON SILICON NANOSTRUCTURESAuthor:
NAVARRO URRIOS DANIEL.
Year:
2006.
University:
LA LAGUNA [
www.ull.es].
Place of defense: FACULTAD DE FISICA.
Place of preparation: DEPARTAMENTO DE FISICA BASICA, UNIVERSIDAD DE LA LAGUNA.
Summary: The thesis is essentially divided into three parts: The first is devoted to the investigation of waveguides flat Silico porous rusty, the second to study waveguides of Silicon nanocrystals and third amplification optic waveguides of nanoclusters Silicon containing iónes of Erbium. The first part presents the characterization of optical waveguides of oxidized porous silicon through a device m-line which allows a good determination of modal effective rate. We have studied two types of waveguides. The first oxidized porous silicon used both for the kernel as for the cladding of the waveguide, while the second type has been a core polymer deposited on a layer of oxidized porous silicon high porosity. The infiltration of dyes within the waveguides has been done to obtain optical amplification. Although it has not been proven laser action, the results validate the winnings optic oxidized porous silicon as a matrix for the infiltration of active materials for laser action. It has also demonstrated that oxidized porous silicon acts as a good cladding material to deposit thin films of other materials to obtain guiás wave with good properties. The second part shows the careful characterization of optical waveguides based on nanocrystals in terms of modal analysis and birrefringencia. A modeling fits the experimental results of two sets of samples. This chapter also has studied the birrefringencia so that has been observed in some specimens with reactive deposited silicon, because of the shape of the ellipsoid nanocrystals created. In the third, the goal was to study the optical amplification at 1.5 microns in iónes of Erbium sensitized by the presence of nanoclusters Silicon. It describes the spectroscopy of Erbium, and fundamental constants such as the absorption cross section and the half-life radiative are measures for the first time in sets of samples with different refractive indices. The results are interpreted as corrections field to the local section effective absorption of Erbium. In continueación are modeled mechanisms that limit the optical amplification systems of equations pace they are able to explain and adjust the experimental results, which demonstrates for the first time, induced absorption due to confined carriers and the possibility of observing an increase in optical once the signal that the effects detrimentales are slight. We have shaped and interpreted experimental results although there has been net gain.
