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Master's Dissertation
DOI
https://doi.org/10.11606/D.3.2012.tde-23032012-115636
Document
Author
Full name
Fábio Izumi
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2012
Supervisor
Committee
Kassab, Luciana Reyes Pires (President)
Alayo Chávez, Marco Isaías
Siarkowski, Acácio Luiz
Title in Portuguese
Produção e caracterização de filmes finos amorfos para aplicações em dispositivos fotônicos.
Keywords in Portuguese
BWT
Filmes finos
Fotônica
Guia de onda
Sputtering
Vidro
Abstract in Portuguese
O presente trabalho possui como objetivo o estudo das propriedades dos filmes finos amorfos para aplicações em dispositivos fotônicos. Foram produzidos, por meio da técnica sputtering, filmes finos de telureto BWT, a partir de alvos cerâmicos com composição em peso de 54,6 TeO2 - 22,6 WO3 - 22,8 Bi2O3. A escolha dos vidros BWT se deve às qualidades elétricas e ópticas dos teluretos. Filmes com nanopartículas de ouro foram produzidos e a nucleação das nanopartículas se deu por tratamento térmico. Os filmes produzidos foram caracterizados pelas técnicas de elipsometria, perfilometria, espectrometria de fluorescência de raios-X por energia dispersiva, difração de raios-X, transmissão, absorção e microscopia eletrônica de transmissão e de varredura. Como etapa, final foram produzidos guias de onda do tipo rib por meio de procedimentos de corrosão e litografia, a fim de que fossem testados guiamentos de luz em 632,8 nm e em 1050 nm. Foram usados diferentes fluxos de SF6 para corrosão dos filmes, resultando em guias de diferentes valores de h_core. Os guias com h_core de 63 e 82 nm apresentaram perda de no máximo 3,5 dB/cm para guiamento em 632,8 e 1050 nm em guias com larguras que variaram de 6 a 10 m. As simulações realizadas mostraram guiamento multímodo para todos os casos. O material BWT é, portanto, promissor para aplicações em dispositivos fotônicos.
Title in English
Production and characterization of amorphous thin films to applications in photonic devices.
Keywords in English
BWT
Glass
Photonics
Sputtering
Thin films
Waveguide
Abstract in English
The objective of this present work is study the properties of amorphous thin films for applications in photonic devices. Thin films of tellurite BWT were produced by sputtering technique using targets whose compositions in weight are 54.6 TeO2 - 22.6 WO3 - 22.8 Bi2O3. BWT was chosen due to the electrical and optical properties of tellurite. Films with gold nanoparticles were produced and the nucleation of the nanoparticles was obtained by heat treatment. Films were characterized by the techniques of elipsometry, perfilometry, energy dispersive X-ray spectroscopy, X-ray diffraction, absorption, transmission, scanning electronic and transmission electronic microscopies. The final step was production of BWT rib waveguides using lithography and reactive-ion etching in order to test light guiding at 632.8 nm and 1050 nm. BWT rib waveguides were produced, using different flux of SF6 for the etching, resulting in waveguides with different values of h_core. Waveguides with 63 and 82 nm of h_core presented maximum loss of 3,5 dB/cm at 632.8 nm and 1050 nm wavelengths in guides with widths ranging from 6 to 10 m. All simulations showed multimode guiding. The BWT material is a potential candidate for applications in photonic devices.
 
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Publishing Date
2012-04-09
 
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