论文标题
单个跨表面的纯涡流生成的任意极化转换
Arbitrary polarization conversion for pure vortex generation with a single metasurface
论文作者
论文摘要
光涡流束的纯度取决于其能量在不同方位角和径向模式之间的扩散。较小的是散布，涡旋纯度越高，其创建和检测效率就越高。有几种方法可以生成具有定义明确的轨道角动量的涡流梁，但是只有很少的存在允许选择纯径向模式的涡流。这些通常由许多具有相当复杂排列的光学元素组成，包括主动腔谐振器。在这里，我们表明，可以使用单个元表面板与偏振器结合使用单个跨表板来生成纯涡流束。我们通过考虑任意输入极化状态的双折射纳米柱进行了现有的独立阶段和振幅控制理论。即使在大量的拓扑费用的情况下，即使在大量的拓扑费用的情况下，也可以使所提供的方法成为强大的复杂振幅调制工具，使所提供的方法成为强大的复杂振幅调制工具。
The purity of an optical vortex beam depends on the spread of its energy among different azimuthal and radial modes. The smaller is this spread, the higher is the vortex purity and the more efficient are its creation and detection. There are several methods to generate vortex beams with well-defined orbital angular momentum but only few exist allowing to select a pure radial mode. These typically consist of many optical elements with rather complex arrangements, including active cavity resonators. Here we show that it is possible to generate pure vortex beams using a single metasurface plate in combination with a polarizer. We generalize an existing theory of independent phase and amplitude control with birefringent nanopillars considering arbitrary input polarization states. The high purity, sizeable creation efficiency and impassable compactness make the presented approach a powerful complex amplitude modulation tool for pure vortex generation, even in the case of large topological charges.
