用于产生和操纵强光学涡旋的等离子体q板
Plasma q-plate for generation and manipulation of intense optical vortices
摘要：
光学涡旋是一种光波，其波前围绕其传播轴扭曲，光束中心为零强度。其独特的空间场结构使其具有广泛的应用，包括光通信、量子信息、超分辨显微镜和粒子的多维操纵。然而，光学涡旋的可达强度受到材料电离阈值的限制。这种限制可以通过使用等离子体介质来消除。在这里，我们提出了适当磁化的等离子体的设计，作为一个q板，导致从高强度高斯光束到扭曲光束的直接转换。等离子体中的圆偏振激光束积累了与方位角相关的相移，从而形成扭曲波前。我们的三维粒子模拟显示了极高的功率转换效率。等离子体q板可以在从太赫兹到光域的大范围频率下工作。
英文摘要：
An optical vortex is a light wave with a twisting wavefront around its propagation axis and null intensity in the beam center. Its unique spatial structure of field lends itself to a broad range of applications, including optical communication, quantum information, superresolution microscopy, and multi-dimensional manipulation of particles. However, accessible intensity of optical vortices have been limited to material ionization threshold. This limitation might be removed by using the plasma medium. Here we propose the design of suitably magnetized plasmas which, functioning as a q-plate, leads to a direct convertion from a high-intensity Gaussian beam into a twisted beam. A circularly polarized laser beam in the plasma accumulates an azimuthal-angle-dependent phase shift and hence forms a twisting wavefront. Our three-dimensional particle-in-cell simulations demonstrate extremely high power conversion efficiency. The plasma q-plate can work in a large range of frequencies spanning from terahertz to the optical domain.
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