Wan Zhensong, Shen Yijie, Gong Mali, Fu Xing
Opt Express. 2018 Dec 24;26(26):34940-34955. doi: 10.1364/OE.26.034940.
We propose a new method of phase-singularities manipulation in optical vortices carrying orbital angular momentum (OAM), namely, quadrant-separable multi-singularity manipulation (QSMSM). In QSMSM, the positions of partial vortices in a quadrant region can be manipulated, while the singularities in other regions remain unchanged. The basic model of the multi-singularity OAM beam is obtained by the principle of coherent superposition of two Hermite-Gaussian modes with spatial mismatch. The actual multi-singularity beams are generated by external modulation with a spatial light modulator. The distribution of vortices trajectory can be controlled by the energy mismatch degree and the spatial mismatch degree. The vortices in a quadrant region can be independently manipulated by partially controlling the energy mismatch degree. The technology of partially tuning singularities in QSMSM improves the flexibility of vortices control and has great potential in applications of optical tweezers and optical modulators.
我们提出了一种在携带轨道角动量（OAM）的光学涡旋中操纵相位奇点的新方法，即象限可分多奇点操纵（QSMSM）。在QSMSM中，可以操纵象限区域内部分涡旋的位置，而其他区域的奇点保持不变。多奇点OAM光束的基本模型是通过两个具有空间失配的厄米-高斯模式的相干叠加原理获得的。实际的多奇点光束是由空间光调制器进行外部调制产生的。涡旋轨迹的分布可以通过能量失配程度和空间失配程度来控制。通过部分控制能量失配程度，可以独立操纵象限区域内的涡旋。QSMSM中部分调整奇点的技术提高了涡旋控制的灵活性，在光镊和光调制器的应用中具有巨大潜力。
