We propose and experimentally demonstrate a single optical element, termed as spiral forked plates (SFPs), to simultaneously generate two tightly focused optical vortices (OVs). The key idea is to combine a spiral zone plate (SZP) and a forked grating (FG) through a logic XOR operation. Both theoretical and experimental results demonstrate that SFPs not only can completely suppress the undesirable zeroth (central) order diffraction, but also can further manipulate the topological charges (TCs) of the two resultant focused OVs by varying the TCs of the SZP and FG, following the so-called TC transformation rule. Thus, SFPs show promising potential for advancing the shrinking and integrating applications of orbital angular momentum superpositions.

中文翻译：

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使用螺旋叉形板定制聚焦光学涡旋

我们提出并通过实验证明了一个光学元件，称为螺旋叉形板（SFP），可同时产生两个紧密聚焦的光学涡旋（OVs）。关键思想是通过逻辑XOR操作将螺旋波带片（SZP）和叉形光栅（FG）组合在一起。理论和实验结果均表明，SFP不仅可以完全抑制不良的零（中心）衍射，而且还可以通过改变SZP和FG的TC来进一步操纵两个合成聚焦OV的拓扑电荷（TC）。所谓的TC转换规则。因此，SFP显示出在推进轨道角动量叠加的缩小和积分应用方面的潜在潜力。