Negative Refractive Index
Mostrando 1-12 de 12 artigos, teses e dissertações.
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1. Radially Periodic Metasurface Lenses for Magnetic Field Collimation in Resonant Wireless Power Transfer Applications
Abstract In this paper, a new procedure and topology of magnetic metasurface lens are proposed for improving the performance of Resonant Wireless Power Transfer systems. Firstly, three subwave-length unit cells are optimized in order to get negative magnetic permeability in the same frequency, each one with a different refractive index, and they are experime
Journal of Microwaves, Optoelectronics and Electromagnetic Applications. Publicado em: 2022
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2. A High Gain Super Wideband Metamaterial Based Antenna
Abstract The paper proposes a high gain, metamaterial based super wideband (SWB) antenna. The SWB antenna has two inverted U slots which are responsible for two notches at 3.5 GHz and 5.5 GHz frequencies. A flower-shaped slot is etched from the radiator to obtain the SWB characteristics. The super wideband antenna has dimensions of 30×35 ×1.5 mm3 with FR4
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2021-06
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3. Effect of Metamaterial Cells Array on a Microstrip Patch Antenna Design
Abstract In this paper, a microstrip patch antenna (MPA) design was developed to verify the performance of a metamaterial cell array (MTM) Capacitive Loaded Loop (CLL) immersed in the substrate. The metamaterial was obtained from metal laminates designed inside a dielectric material, with dimensions carefully calculated to have the effective negative permitt
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2020-09
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4. DENSITY, REFRACTIVE INDEX, APPARENT VOLUMES AND EXCESS MOLAR VOLUMES OF FOUR PROTIC IONIC LIQUIDS + WATER AT T=298.15 AND 323.15 K
Abstract Densities and refractive index of binay mixtures of water with four protic ionic liquids, based on ammonium and fatty acids, were measured at 298.15 and 323.15 K, under atmospheric pressure. Apparent and excess molar volumes were obtained by experiments and fitting data to the Redlich-Meyer (RM), Redlich-Kister (RK) and Prigogine-Flory-Patterson (PF
Braz. J. Chem. Eng.. Publicado em: 2015-09
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5. Investigation on Physical Properties of Semiorganic Nonlinear Optical Glycine Zinc Sulfate Single Crystal
Nonlinear optical single crystals of Glycine Zinc Sulfate (GZS) were grown by slow evaporation technique. Single crystal X-ray diffraction analysis revealed the crystal system and lattice parameter values. Powder X-ray diffraction analyses have been carried out and the diffraction patterns have been indexed. The optical properties of the crystals were determ
Mat. Res.. Publicado em: 2015-06
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6. Efeitos dos parâmetros da extração e avaliação da qualidade física e química dos óleos de baru e amendoim / Effects of parameter extraction and quality assessment ofphysics and chemistry of baru and peanut oil
This work aimed to optimize the extraction of baru oil (Dipteryx alata Vog.) by continuous mechanical pressing and assess its quality compared to peanut oil extracted under the same conditions, since both have similar characteristics. The characterization of fruit and baru almonds from southern state of Goiás was carried out, determining their chemical comp
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/02/2012
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7. Effect of particle size on nonlinear refractive index of Au nanoparticle in PVA solution
Nonlinear refractive index of Au nanoparticle suspended in PVA solution was measured using a single beam Z-scan technique. Measurements were carried out using a green CW laser beam operated at 532 nm as excitation source. Five nanoparticle samples with different particle sizes were prepa red by γ radiation method. The Au nano-fluid shows a good third order
Brazilian Journal of Physics. Publicado em: 2010-06
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8. Localized beams in optical tweezers with conventional and metamaterial particles / Feixes localizados em pinças opticas com particulas convencionasi e metamateriais
In this thesis, we explore some applications of localized beams in FSO - Free Space Optics - and optical tweezers, greater emphasis been given to the second one. For FSO, we show that it is possible to choose the desired longitudinal intensity pattern by using optical elements adequately modeled in their phase functions: the axicons. In this way, these beams
Publicado em: 2009
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9. Experimental methodology to development of metamaterial grids with near-zero and negative permittivity / Metodologia experimental de desenvolvimento de grades metamateriais com permissividade quase-zero e negativa
Metamateriais são estruturas ou arranjos geométricos feitos a partir de materiais comuns, dielétricos, condutores, magnéticos ou por combinação destes. Os metamateriais caracterizam-se principalmente por apresentarem propriedades especiais de permissividade ( e) e permeabilidade ( µ) não encontradas nos materiais em estado natural, cujo principal efe
Publicado em: 2009
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10. SÃntese e caracterizaÃÃo de nanopartÃculas de nÃquel para Ãptica nÃo linear / SÃntese e caracterizaÃÃo de nanopartÃculas de nÃquel para Ãptica nÃo linear
In this work, we describe the synthesis of nickel nanoparticles (NPs) stabilized using poly (vinyl pyrrolidone), their structural and optical (linear and nonlinear) characterization. In Chapter 1 we present a general introduction describing the work performed. In Chapter 2 it is presented a review of nickel NPsâ properties and some synthesis processes. In C
Publicado em: 2008
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11. Reflection from a flat dielectric film with negative refractive index
We analyse the reflection of a TM electromagnetic field first on a flat dielectric film and second on a Veselago film with negative refractive index, both films being deposited on a metallic substrat acting as a mirror. An incident harmonic plane wave generates inside a conventional dielectric film a refracted propagating wave and an evanescent wave that doe
Brazilian Journal of Physics. Publicado em: 2007-12
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12. Invisible liposomes: Refractive index matching with sucrose enables flow dichroism assessment of peptide orientation in lipid vesicle membrane
Valuable information on protein–membrane organization may in principle be obtained from polarized-light absorption (linear dichroism, LD) measurement on shear-aligned lipid vesicle bilayers as model membranes. However, attempts to probe LD in the UV wavelength region (<250 nm) have so far failed because of strong polarized light scattering from the vesicle
National Academy of Sciences.