Análise de sensor plasmônico na configuração emissão acoplada via função de Green 3D

Abstract

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.