Navegando por Assunto "Plasmônica"

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Acesso aberto (Open Access)
Análise de sensor plasmônico na configuração emissão acoplada via função de Green 3D
(Universidade Federal do Pará, 2018-09-28) CRUZ, André Felipe Souza da; DMITRIEV, Victor Alexandrovich; http://lattes.cnpq.br/3139536479960191; COSTA, Karlo Queiroz da; http://lattes.cnpq.br/7932708321834647
In the present work, a theoretical study on a plasmon resonance sensor in the Surface Plasmon Coupled Emission (SPCE) configuration is presented. Coupled to the sensor structure is a microfluidic channel containing suspended target particles (gold nanoparticles functionalized to attract fluorescent molecules), which when excited and immobilized upon the sensor structure can be efficiently modeled as a planar array of induced dipoles. The electromagnetic modeling of the device was performed by the magnetic potential, defined by means of the Periodic Green Function (PGF) 3D. The electromagnetic fields are presented in terms of the discrete spectral representation by the complex double Fourier series, and to reduce the number of terms in the series, it is proposed the use the Euler identity. Firstly, parametric field results are presented in the sensor structure, and then the spectral analysis of the magnetic potential field is performed, where the SPP and SW poles appear in the spectral domain. For the validation of the method, the limit case was analyzed, in which the particles are distant from each other, and compared with published works. Finally, results and discussions about the convergence of series in the cosine PGF are presented. The results show good agreement, showing that the theoretical method of PGF 3D is efficient, and can be used as a tool in the design of this sensing device.
Acesso aberto (Open Access)
Otimização de nanoantenas plasmônicas para células solares orgânicas
(Universidade Federal do Pará, 2016-01-18) SILVA JÚNIOR, Marcelino Lopes Corrêa da; DMITRIEV, Victor Alexandrovich; http://lattes.cnpq.br/0684541646225359; COSTA, Karlo Queiroz da; http://lattes.cnpq.br/7932708321834647
This work shows a theoretical nanoantennas study about organic solar cells of thin films, occasioning the increase in the efficiency of light absorption. The unitary organic solar cell formed by a reflector silver block, an active layer formed by the semiconductor P3HT:PCBM and a nanoantenna, also made of silver. The numerical analysis of the device is made through the Finite Element Method; the materials are analysed from the relative permittivity. Firstly, we executed the validation of the nanostructure through the numerical method. Then, we apply the geometric optimization process in the other nanoantenna models. This optimization process was based on nanoantennas geometrical parameters preserving its superficial area. Since were considered four new models of nanoantennas with different geometrical parameters, which means, conical nanoantennas, root cone, and exponential root cone 1 and 2. It was observed, from the efficiency of integrated absorption for different incidence angles and light polarization, current density and plasmonic decay that the nanoantennas, the root cone and the exponential cone 2, gave better performance compared to the other models.