摘要
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.
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.
基金
supported by the National Basic Research Program of China(973 Program)(No.2014CB340000)
the National Natural Science Foundations of China(Nos.61323001,61490715,51403244,and 11304401)
the Natural Science Foundation of Guangdong Province(No.2014A030313104)
