| Popis: |
In this paper, comparative modeling of optical vortices focusing by phase and amplitude zone plates is presented. The FullWAVE software package based on finite difference time domain method was used for numerical simulation. The linearly polarized Gaussian vortex beams with wavelength of 532 nm, waist of 8 μm, and topological charge 1, 2 and 3 were proposed as incident light. It is shown that the material of zone plate can significantly influence on focusing process. However, than the higher the topological charge of incident beam the more similar formed by phase and amplitude zone plats at the focus fields are. |
