[IEEE 2018 20th International Conference on Transparent Optical Networks (ICTON) - Bucharest (2018.7.1-2018.7.5)] 2018 20th International Conference on Transparent Optical Networks (ICTON) - Off-Axis Vortex Beams Diffracted by a Circular Grating

摘要： We examine vortex beams shifted from optical axis and diffracted by a circular grating or a binary diffractive axicon. We consider the diffractive axicons with a numerical aperture equal to 0.95 and 0.5. Modelling of diffraction is numerically realized in the 3D-model by the finite difference time domain (FDTD) method.