Zhang Bolun, Hu Zheng-da, Wang Jicheng, Wu Jingjing, Tian Sang
Opt Express. 2022 Oct 24;30(22):40231-40242. doi: 10.1364/OE.475158.
Optical vortex beam carrying orbit angular momentum has been extensively researched and applied recently. Among which a perfect vortex beam (PVB) has attracted much attention owing to its topological charge (TC)-irrelevant intensity profile. However, the morphology singularity, as well as implementation complexity of the PVB tie the degree of freedom for multiplexing. Herein, by introducing the concept of a composite vortex beam, we originally propose a novel kind of PVB - perfect composite vortex beam (PCVB) - which possesses a rosette-like intensity pattern that is exactly correlated with the TC and can be directly generated using a single all-dielectric geometric metasurface rather than bulky optical systems. We numerically simulate the broadband generation of the proposed PCVB with various TCs, sizes, and rotation angles. To further explore the potential of our design in practical applications, we demonstrated the coaxial array of the PCVBs and detected their optical angular force for manipulating nanoparticles. We believe that our fruitage may pave a desirable avenue for optical communication, information processing, and optical manipulation.
携带轨道角动量的光学涡旋光束近年来得到了广泛的研究和应用。其中，完美涡旋光束（PVB）因其与拓扑电荷（TC）无关的强度分布而备受关注。然而，PVB的形态奇异性以及实现复杂性限制了复用的自由度。在此，通过引入复合涡旋光束的概念，我们首次提出了一种新型的PVB——完美复合涡旋光束（PCVB），它具有与TC精确相关的玫瑰花样强度图案，并且可以使用单个全介质几何超表面直接生成，而无需庞大的光学系统。我们对具有各种TC、尺寸和旋转角度的所提出的PCVB的宽带生成进行了数值模拟。为了进一步探索我们的设计在实际应用中的潜力，我们展示了PCVB的同轴阵列，并检测了它们用于操纵纳米粒子的光学角力。我们相信，我们的成果可能为光通信、信息处理和光学操纵开辟一条理想的途径。
