Navegando por Autor "COSTA, Karlo Queiroz da"

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Acesso aberto (Open Access)
Análise teórica de novos tipos de antenas de banda larga e de dimensões reduzidas
(Universidade Federal do Pará, 2017-04-28) COSTA, Karlo Queiroz da; DMITRIEV, Victor Alexandrovich; http://lattes.cnpq.br/3139536479960191
Acesso aberto (Open Access)
Analysis of modified bowtie nanoantennas in the excitation and emission regimes
(2011-06) COSTA, Karlo Queiroz da; DMITRIEV, Victor Alexandrovich
In this work, we analyze modified bowtie nanoantennas with polynomial sides in the excitation and emission regimes. In the excitation regime, the antennas are illuminated by an incident plane wave, and in the emission regime, the excitation is fulfilled by infinitesimal electric dipole positioned in the gap of the nanoantennas. Several antennas with different sizes and polynomial order were numerically analyzed by method of moments. The results show that these novel antennas possess a controllable resonance by the polynomial order and good characteristics of near field enhancement and confinement for applications in enhancement of spontaneous emission of a single molecule.
Acesso aberto (Open Access)
Comparative analysis of circular and triangular gold nanodisks for field enhancement applications
(2010-12) COSTA, Karlo Queiroz da; DMITRIEV, Victor Alexandrovich
In this paper, we present a quantitative comparison of circular and triangular gold nanodisks with the same length and thickness. The method of moments is used to solve numerically the scattering problem. With this model, we investigate the spatial near field distribution, spectral response, far field diagrams, and bandwidth wavelength of these particles. Our results show that the resonant wavelength and the near field enhancement and confinement of the triangular particle are larger than those for the circular particle, but the resonance bandwidth and scattering cross section of the triangular particle are smaller.
Acesso aberto (Open Access)
Development of computational 3D MoM algorithm for nanoplasmonics
(2013-12) SOUZA, Nadson Welkson Pereira de; COSTA, Karlo Queiroz da; DMITRIEV, Victor Alexandrovich
In this paper, we present an algorithm for full-wave electromagnetic analysis of nanoplasmonic structures. We use the three-dimensional Method of Moments to solve the electric field integral equation. The computational algorithm is developed in the language C. As examples of application of the code, the problems of scattering from a nanosphere and a rectangular nanorod are analyzed. The calculated characteristics are the near field distribution and the spectral response of these nanoparticles. The convergence of the method for different discretization sizes is also discussed.
Acesso aberto (Open Access)
Resonant properties, of modified triangular plasmonic nanoparticles with higher field concentration
(2013-12) COSTA, Karlo Queiroz da; DMITRIEV, Victor Alexandrovich
In this paper, we present an analysis of the resonant response of modified triangular metallic nanoparticles with polynomial sides. The particles are illuminated by an incident plane wave and the method of moments is used to solve numerically the electromagnetic scattering problem. We investigate spectral response and near field distribution in function of the length and polynomial order of the nanoparticles. Our results show that in the analyzed wavelength range (0.5-1.8) µm these particles possess smaller number of resonances and their resonant wavelengths, near field enhancement and field confinement are higher than those of the conventional triangular particle with linear sides.