NANOCYLINDERS MADE OF NOBLE METALS AS SCATTERERS OF PLANE ELECTROMAGNETIC WAVE

Abstract

Nanowires and nanotubes made of noble metals are widely used in today’s technologies as elements of lasers, biosensors and other devices. However, not all possible problems arising in study of such objects are presented in literature. In this paper, by means of numerical simulation, the cylindrical nanoobjects made of gold and silver are considered as a specific prism that is capable of selecting isolated wavelength bands and scattering them at different angles. For this purpose a plane H-polarized electromagnetic wave scattering by nanocylinders with or without concentric dielectric cover or nanotubes made out of silver and gold in the visible range of wavelengths are studied. The scattering problem is solved in the classical manner, by separation of variables in polar coordinates. The complex permittivity is used in computations of gold and silver based on published experimental data. The results suggest that the studied nanoobjects can serve as a frequency-selective receiver or an optical filter which selects and rejects at different angles some wavelengths, but there is a great influence of geometrical parameters of scatterers and the dielectric constant of the coating.

Keywords

• plasmon
• surface plasmon resonance
• wave scattering