PLASMONIC RESPONSE OF GOLD- SILICA AND SILVER- SILICA METAL CORE NANOSHELLS BY OPTIMIZING THE FIGURE OF MERIT

• DOI: 10.37572/EdArt_3006213615

• Palavras-chave: RI, FEM, COMSOL, FoM

• Keywords: RI, FEM, COMSOL, FoM

• Abstract:

  Plasmonic nanoaggregates have great potential for sensing applications, due to their spectral sensitivity response to the surrounding environment of the nanostructure and efficient extinction efficiency. A novel refractive index (RI) based SPR nano scale sensor which composed of metallic (Au/Ag) core and silica shell has been analysed theoretically. To simulate the proposed geometry in radio frequency module, 3-D finite element method (FEM), an efficient tool to investigate the electromagnetic properties and electric field distribution surrounding the nanoparticle surface, based on commercially available software COMSOL Multiphysics were utilized. In FEM simulation, to determine the scattered field distribution and extinction cross section the nanostructure surface was divided into extremely small mesh elements which lead to finer size. The background field amplitude was fixed 1 Vm-1 and to restrain the simulation from any reflection, a perfectly matched layer was created around the nanostructure. We found dielectric metal nanoshells to be more absorbing with gold core compared to silver core, leading to high figure of merit (FoM) for Ag nanoshell 3.0, having the same silica shell thickness 5 nm. This result points out that our proposed multilayer geometry can be extended to other systems, enabling the plasmonic sensors have a high FoM over wide spectral ranges with phenomenal accuracy)

• Número de páginas: 10