Clerc M G, Ferré M, Gajardo-Pizarro R, Zambra V
Departamento de Física and Millennium Institute for Research in Optics, FCFM, Universidad de Chile, Casilla 487-3, Santiago, Chile.
Phys Rev E. 2022 Jul;106(1):L012201. doi: 10.1103/PhysRevE.106.L012201.
The interaction of light beams with helical defects in optical materials generates optical vortices. Understanding and manipulating the dynamics of helical defects allows for the creation of versatile sources of optical vortex beams. Using a magnetic ring on a nematic liquid crystal cell, we trapped helical defects identified as matter vortices. We observe oscillatory rotating and beating matter vortices by applying a low-frequency voltage. Experimentally, we determine the region of parameters where these vortices are observed. The amplitude of oscillatory rotating vortices decays with the inverse of the voltage frequency. We propose an adequate amplitude equation, which allows us to describe the vortex dynamics; theoretical findings have a qualitative agreement with the experimental observations.
光束与光学材料中的螺旋缺陷相互作用会产生光学涡旋。理解并操控螺旋缺陷的动力学特性有助于创造出多功能的光学涡旋光束源。通过在向列相液晶盒上使用一个磁环，我们捕获了被识别为物质涡旋的螺旋缺陷。通过施加低频电压，我们观察到了振荡旋转和拍频的物质涡旋。在实验中，我们确定了观察到这些涡旋的参数区域。振荡旋转涡旋的振幅随电压频率的倒数而衰减。我们提出了一个合适的振幅方程，它能让我们描述涡旋动力学；理论结果与实验观测在定性上相符。
