利用非传统螺旋相位调控高阶涡旋光束的拓扑结构∗

摘要

This paper proposes a method for controlling the topological structures in high-order optical vortices by employing a noncanonical phase structure. The control of the evolutions in high-order optical vortices by using a noncanonical phase structure with a nonuniform azimuthal gradient is studied numerically and experimentally. Results show that the propagation of high-order optical vortices along with a noncanonical phase structure becomes a decayed optical distribution with multiple one-charged singularities along a line. In addition, the control from the noncanonical phase structure can suppress random evolutions of topological structures resulted from the phase noise. These conclusions may indicate a new method to control the decay of high-order optical vortices, and promising potential applications in many fields, such as optical vortices-based optical communications and optical tweezers.%本文提出一种利用非传统螺旋相位调控高阶涡旋光束拓扑结构的方法。数值模拟并实验研究了具有不均匀旋转梯度的非传统螺旋相位对高阶涡旋光束的调控行为。结果表明，携带有非传统螺旋相位的高阶涡旋光束在传输过程中，将退化为沿一条直线排列的多个一阶相位奇点，并且，这种非传统螺旋相位对高阶涡旋光束的调控特性，可抑制相位噪声等扰动所引起的拓扑结构随机退化现象。本文的结论为涡旋光束拓扑结构的调控提供了一种可行的新途径，在基于涡旋光束的光学通信、光学操控等方面具有潜在应用。