Light Scattering on Gold Nanosphere

The systems of nanoparticles absorbed on the substrate are of the practical interest now due to the multiple applications of these systems in nanosensors, waveguides, electronic devices and lately in PV elements for improving of their efficiency [1]. Such quasi-two-dimensional systems show novel properties and behavior that is different from the bulk material properties and are of a particular interest of the nowadays experimental tasks.

The author suggests a method of modeling such system and examining the properties of the nano surface with the absorbed nanoparticle by calculating the absorption and scattering of a plane wave of visible light by such system. The scattering is computed for the optical frequency range. It was shown that the absorption profiles depend on the geometry of the system and on the shape of the particle [2] . We study the case of a gold nanosphere on a substrate. Gold can be modeled as a material with negative complex-valued permittivity. It was shown that the scattering profiles are different depending on the light’s wavelength. At longer wavelengths, the scattered fields from the sphere look more as the radiation pattern of a dipole antenna. The radius of the sphere can also be varied to examine how the absorption depends upon the geometry.

1. Study of the nanosurface properties by analyzing its absorption and scattering cross-section. I.Bariakhtar, APS March Meeting Proceedings, 2016

2. Interaction between localized-on-nanoparticles plasmon polaritons and surface plasmon polaritons. Irina Bariakhtar, Y. Demidenko, V. Lozovski. J. Opt. Soc. Am. B 30(4), 1022 (2013)