Studying The Extinction Properties Of Au Nanorod And Au Nanotube Using The Dda Calculation Method

Because nisotropic gold particles in the nanometer scale,in particular, the Au structural materials of one-dimensional structure have more exotic optical and electrical properties than isotropic spherical gold nanoparticles,so they have a greater potential applications in the field of biomedical and optoelectronics devices.The discrete dipole approximation theory in recent years has been a new methods,it can calculate absorption,scattering and extinction properties of metal nanoparticles of arbitrary shape and size in principle.This method occupies less computing resources and has no the limit of the size and shape in calculating interaction between light and metal nanoparticals,so it shows the strong superiority in the calculation.This paper explores the relationship between the optical properties of one-dimensional structure gold nanorod,gold nanotubular as well as gold nanorods-rod structure and gold tube-tube structure and the corresponding gold particle size.In this paper,extinction, absorption and scattering spectra of different size gold nanopartical in specific dimensions have been given and comparisons between the extinction spectra with the change of specific structural parameters of gold nanopartical alse are given. We can see changes of extinction, absorption, scattering peak by analyzing the spectra.The results show that extinction properties of gold nanoparticles of the different shapes have quite a complex relationship with its size,and extinction of all have different changes with the changes of the radial and transverse geometry parameters.In this paper, we study changes of peaks of longitudinal surface plasmon resonance of gold nano-rod,gold nano-tube structure with the change of the vertical and horizontal parameters, and on Au nanorod-rod and nanotube-tubular structural materials,we compare changes of the surface plasmon resonance peak when the distance between their central axis change.