Cosine-type apodized spiral zone plate to handle the topological charge of a vortex beam

By taking advantage of spiral petal-like zone plates, we have recently demonstrated that a element’s geometric shape impacts its charge. Keeping it in mind, aim to control the topological charge vortex using phase modification plate without transforming geometrical shape. This is achieved by apodizing having p zones with radial grating spatial frequency m. Having implemented some gratings different m, realized an optical produced whose and handedness depend on Consequently, constant replaces on-axis screw dislocation under situation takes odd multiples Studies are carried out for large small pairs (p, m) various gaps between couple.