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.
Highlights
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 based on the caustic method, whose main lobes move exactly along helical trajectories
The angular spectrum of this kind of beams is found to be conjugated with one of the helico-conical beams previously proposed[27], which suggests that the helical propagation behaviors of the helico-conical beam before the focus is easy to explain
Summary
Light fields with extraordinary propagation behaviors, such as nondiffracting and self-bending, are useful in the optical delivery of energy, information, and even objects. The helical beam is highly adjustable, including the radius and period of the helix, as well as the number of rotations and main lobes.
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