Microcavities
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. Femtosecond lasers for processing glassy and polymeric materials
Novel materials have been developed to meet the increasing mechanical, electrical and optical properties required for technological applications in different fields of sciences. Among the methods available for modifying and improving materials properties, femtosecond laser processing is a potential approach. Owing to its precise ablation and modification cap
Mat. Res.. Publicado em: 27/09/2013
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2. Mechanical strength and analysis of fracture of titanium joining submitted to laser and tig welding
This study compared the tensile strength and fracture mechanism of tungsten inert gas (TIG) welds in cylindrical rods of commercially pure titanium (cp Ti) with those of laser welds and intact samples. Thirty dumbbell-shaped samples were developed by using brass rods as patterns. The samples were invested in casings, subjected to thermal cycles, and position
Mat. Res.. Publicado em: 09/10/2012
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3. Superfícies super-hidrofóbicas obtidas através de microestruturas litografadas. / Superhydrophobic surfaces obtained by microstructures lithographed.
Aqui apresentamos um modelo teórico para superfícies super-hidrofóbicas que são formadas por superfícies contendo padrões periódicos na forma de microcavidades. Com este modelo obtivemos a relação ideal entre profundidade e diâmetro das cavidades para que a superfície manifeste seu caráter super-hidrofóbico. Assim, fabricamos superfícies em PDM
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 07/10/2011
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4. Desenvolvimento de estruturas monolíticas de guias de ondas acoplados a micro-cavidades / Development of monolithic structures with waveguides coupled to microcavities
As micro-cavidades ópticas são componentes essenciais em sistemas ópticos integrados, pois elas permitem capturar seletivamente, liberar e armazenar fótons, além de promoverem suas interações. Como exemplo, os micro-discos e micro-anéis são elementos que proporcionam tempos de vidas fotônicos extremamente longos, que podem ser utilizados tanto para
Publicado em: 2010
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5. Bi-estabilidade óptica &condensação de Bose-Einstein de polaritons
Optical bistability e®ects (OB) are intrinsically related to the gain media non-linearities. In microcavities, this behavior is due to Kerr effect proportionate by polariton number, generated resonantly in strong -coupling regime, instead of the photon number. The sample was held in a cold-finger cryostat at a temperature of 10K and is constituted by two DB
Publicado em: 2008
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6. Use of raw material obtained from a renewable source in tbhe preparation of phenolic type matrix composites / Utilização de matéria-prima obtida de fonte renovável na preparação de compósitos de matriz tipo fenólica
In the present work phenolic type matrices were prepered, which were reinforced with lignocellullosic fibers (sisal). The tannin-phenolic and phenol-furfural resins, amid other techniques, were characterized by nuclear magnetic resonance (NMR). Model compounds were synthesized specially for the 1H and 13C NMR analysis of phenol-furfural resins. The sisal fib
Publicado em: 2008
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7. Frenkel-exciton-polaritons in organic microcavities
We study organic microcavities in the strong coupling regime. The cavity exciton-polariton dispersion relations and quantum states are derived in using a microscopic theory. We consider the two cases of anisotropic organic crystals with one and two molecules per unit cell. In general, the cavity exciton-polaritons are a coherent superposition of both cavity
Brazilian Journal of Physics. Publicado em: 2006-06
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8. Films of post-consumer polypropylene composites for the support layer in synthetic paper
Composite films were studied as possible candidates for the central or support layer of synthetic paper in a multilayer structure. Recycled post-consumer polypropylene films were reinforced with inorganic fillers at various compositions and under several processing conditions, with the aim of optimizing the physical and mechanical properties of rigidity and
Polímeros. Publicado em: 2006-06
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9. In vivo reproducibility and correlation of visual and laser fluorescence methods for the detection of pits and fissures with discoloration in primary molars / Reprodutibilidade e correlação in vivo dos métodos visuais e de fluorescência a laser na detecção de descolorações em sulcos e fossetas oclusais de molares decíduos
Aiming at developing an in vivo study of the reproducibility and correlation of two visual indexes (Ekstrand et al. (1998) ? E and Nyvad; Machiulskiene and Baelum (1999) ? N) and the measures of laser fluorescence (DIAGNOdent®,KaVo - DD) for the detection of decolorised pits and fissures, a single trained examiner, after the free and aware consent of 28 pat
Publicado em: 2006
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10. Avaliação clinica de quatro metodos de diagnostico de lesões de carie oclusal
The goaI of this study was to compare different clinicaI diagnostic methods: fluorescent laser (DIAGNOdent system), direct digital radiograph (CDR system), bitewing radiographs and visual inspection for occlusal surf.aces. The sample w.as constitutM of 153 first permanent molars with microcavities of 6 to 8-year-old children ofboth sexes, who live in Piracic
Publicado em: 2002
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11. Polariton lasing vs. photon lasing in a semiconductor microcavity
Nearly one decade after the first observation of Bose–Einstein condensation in atom vapors and realization of matter-wave (atom) lasers, similar concepts have been demonstrated recently for polaritons: half-matter, half-light quasiparticles in semiconductor microcavities. The half-light nature of polaritons makes polariton lasers promising as a new source
National Academy of Sciences.