Vijayakumar A, Rosales-Guzmán C, Rai M R, Rosen J, Minin O V, Minin I V, Forbes A
Opt Express. 2019 Mar 4;27(5):6459-6470. doi: 10.1364/OE.27.006459.
Structured light has been created by a myriad of near-and far-field techniques and has found both classical and quantum applications. In the case of orbital angular momentum (OAM), continuous spiral phase patterns in dynamic or geometric phase are often employed with the phase patterns existing across the entire transverse plane. Here, we exploit the uncertain relationship between OAM and angle in order to create structured OAM fields by using multilevel OAM holograms. We show theoretically and experimentally that only a multilevel angular phase contour in the near-field is needed to create structured OAM light in the far-field, exploiting the reciprocal nature of angular momentum and angle. We use this approach to demonstrate exotic 3D structured light control to show the Poynting vector's evolution in such fields and to highlight the physics underlying this phenomenon.
通过无数近场和远场技术产生了结构化光，并且其已在经典和量子应用中得到应用。就轨道角动量（OAM）而言，动态或几何相位中的连续螺旋相位图案经常被采用，且相位图案存在于整个横向平面。在此，我们利用OAM与角度之间的不确定关系，通过使用多级OAM全息图来创建结构化OAM场。我们通过理论和实验表明，利用角动量和角度的互易性质，在近场中仅需要一个多级角相位轮廓就能在远场中创建结构化OAM光。我们使用这种方法来演示奇特的三维结构化光控制，以展示在这些场中坡印廷矢量的演变，并突出这一现象背后的物理原理。
