| Abstract: | Light fields with extraordinary propagation behaviors,such as nondiffracting and self-bending,are useful in the optical delivery of energy,information,and even objects.A kind of helical beam is constructed here based on the caustic method.With the appropriate design,the main lobe of these helical beams can be both well-confined and almost nondiffracting,while moving along a helix with its radius,period,number of rotations,and main lobes highly adjustable.In addition,the peak intensity of the main lobe fluctuates below 15%during propagation.These promising characteristics may enable a variety of potential applications based on these beams. |
