Sabatyan Arash, Taheri Balanoji Seyyed Mojtaba, Taheri Balanoji Seyyed Mortaza
J Opt Soc Am A Opt Image Sci Vis. 2016 Sep 1;33(9):1793-7. doi: 10.1364/JOSAA.33.001793.
Herein, we present a so-called multiregion spiral square zone plate (MRSSZP), in which a spiral square zone plate is divided into a few regions, so that every region is composed of Fresnel zones, and the first zone of a given region is the same as the last zone of the previous region from a transmission point of view. We show that an MRSSZP can generate unique features of an array of an optical vortex with topological charge ±1, so that the number of vortices is directly related to the number of regions. We also demonstrate that, for an MRSSZP with topological charge 2, an array of dark cores is formed, which have phase structures similar to that of the interference of optical vortices with opposite topological charges. Besides, the focused vortex array follows a modulo-4 transmutation rule. In addition, when the topological charge becomes multiples of 4, an array of focal bright spots surrounded by a dark ring is generated. Numerical and experimental results verify the superior features of an MRSSZP.
在此，我们提出一种所谓的多区域螺旋方形波带片（MRSSZP），其中螺旋方形波带片被划分为几个区域，使得每个区域由菲涅耳带组成，并且从透射的角度来看，给定区域的第一个带与前一个区域的最后一个带相同。我们表明，一个MRSSZP可以产生具有拓扑电荷±1的光学涡旋阵列的独特特征，从而使涡旋的数量与区域的数量直接相关。我们还证明，对于具有拓扑电荷2的MRSSZP，会形成一系列暗核，其相位结构类似于具有相反拓扑电荷的光学涡旋干涉的相位结构。此外，聚焦涡旋阵列遵循模4变换规则。另外，当拓扑电荷变为4的倍数时，会产生由暗环包围的一系列焦亮点。数值和实验结果验证了MRSSZP的优越特性。
