Photonics
Mostrando 13-24 de 31 artigos, teses e dissertações.
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13. The role of nonequilibrium thermo-mechanical statistics in modern technologies and industrial processes: an overview
The nowadays notable development of all the modern technology, fundamental for the progress and well being of world society, imposes a great deal of stress in the realm of basic Physics, more precisely on Thermo-Statistics. We do face situations in electronics and optoelectronics involving physical-chemical systems far-removed-from equilibrium, where ultrafa
Brazilian Journal of Physics. Publicado em: 2010-03
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14. Oxifluoride glass doped with rare-earth íons for applications in photonics. / Vidros oxifluoretos dopados com íons terras raras para aplicações em fotônica.
A busca por novos materiais hospedeiros candidatos para aplicações em fotônica devido suas propriedades ópticas nos conduziu a caracterização de duas matrizes vítreas dopadas com íons terras raras. As matrizes vítreas a base de fluorofosfatos com a composição típica (NaPO3 PbO MgF2) dopadas com íons de Er3+ com concentração variando de 0,75-5m
Publicado em: 2010
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15. Fabrication and characterization of tellurite and germanate waveguides for optoelectronics applications. / Produção e caracterização de guias de onda de telureto e germanato para aplicações em optoeletrônica.
The objective of this work is the production and characterization of GeO2-PbO and TeO2-ZnO waveguides. The waveguides were produced using thin films and glasses by means of different procedures. The films were produced using the RF magnetron sputtering method and characterized by a variety of techniques. In particular, scanning electron microscopy was essent
Publicado em: 2010
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16. Nonlinear optical properties of organic and organometallic compounds / Propriedades ópticas não lineares de compostos orgânicos e organometálicos
In the last few years, the design and characterization of novel materials exhibiting high optical nonlinearities is the subject of a fast-growing interest because of their potential application in various fields, from biology to photonics. Two-photon absorption processes, for example, have been used for optical limiting, three-dimensional microfabrication, o
Publicado em: 2009
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17. Caracterização espectroscópica e por modelagem mecânico-quântica, de compostos com potencial aplicação em dispositivos ópticos não-lineares
In the present work, the compounds 1-(3,4,5-trimethoxiphenil)-2-(2- tienyl) -5-(4-nitrophenylazo) pirrol (compound 1) and 5-dicianovinyl-5- piperidine-5,2:5:2- tertiophene (compound 2), were characterized using a combination of spectroscopic measurements and quantum mechanical calculation, aiming to evaluate if they present the necessary requisites for appli
Publicado em: 2009
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18. Lições da indústria fotônica para o desenvolvimento tecnológico. / Lessons from photonics industry to technological development.
Esta tese analisa como tecnologias emergentes podem ajudar a fortalecer o desenvolvimento industrial. A preocupação é pertinente, pois a produção tecnológica é um importante componente do desenvolvimento econômico. A partir das observações empíricas da indústria fotônica, nós extraímos algumas lições e propomos um modelo que explica como oco
Publicado em: 2008
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19. Desenvolvimento de um WebLab para estudo e caracterização de sistemas WDM
The advent of the Internet and the development of Information and Communication Technologies (ICTs) generated new spaces for communication and collaboration between groups of people in geographically distinct regions. The association of Web technology with instrument automation and control by computer has made possible the development of the so called Remote
Publicado em: 2008
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20. Caracterização das propriedades ópticas não lineares de vidros teluretos, líquidos orgânicos e colóides de nanopartículas de ouro. / Characterization of the nonlinear optical properties, nonlinear refraction, thermo-optical coefficient, photonics-nonlinear materials.
Nesta tese, investigamos as propriedades ópticas não lineares de quatro sistemas físicos distintos: vidros teluretos, óleo de mamona, líquidos iônicos e colóides de nanopartículas de ouro. Utilizando as técnicas de varredura Z (Z-scan) e varredura de intensidade (I-scan) foi possível determinar os valores das contribuições de origem eletrônica (
Publicado em: 2008
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21. Ferramenta biofotonica integrada para manipulações e microscopias confocais / Integrates biophotonic tool for manipulations and confocal microscopies
The research in biomedical photonics is clearly evolving in the direction of the understanding of biological processes at the cell level. The spatial resolution to accomplish this task practically requires photonics tools. However, an integration of different photonic tools and a multimodal and functional approach will be necessary to access the mechanical a
Publicado em: 2007
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22. Fluid insertion related processes for sensing using photonic crystal fibers / Processos relacionados a inserção de fluidos para sensoriamento com fibras de cristal fotonico
This work presents studies of how to insert fluids (liquid and gas) into microstructured optical fibers, especially photonic crystal fibers, also known as PCF?s. These optical fibers possess air holes that run along its entire length. They can be divided into two major groups: solid core fibers that guide light by total internal reflection and hollow core fi
Publicado em: 2007
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23. Characterization and nanoestructural control of silican made by flame aerosol synthesis / Caracterização e controle nanoestrutural da silica para fotonica produzida pelo metodo de aerosol em chama
The nanostructured silica preform made by the flame aerosol method represents a strategical precursor for technological applications in photonics, such as special optical fibers and high optical transmissivity lenses for ultraviolet radiation. In order to attain such a properties, it becomes particularly important to control the nanostructured characteristic
Publicado em: 2006
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24. Desenvolvimento de um WebLab para experimentos remotos em fotônica integrado a um ambiente virtual de ensino-aprendizagem
The association of Web Technology with instrument automation and control by computer has made possible the development of the so called Remote Laboratories or WebLabs distributed environments that allow to access and control experiments remotely through the Internet. In this work, a WebLab was developed for the remote measurement of the attenuation coefficie
Publicado em: 2006