Structured light with more extended degrees of freedom (DoFs) and in higher dimensions is increasingly gaining traction and leading to breakthroughs such as super-resolution imaging, larger-capacity communication, and ultraprecise optical trapping or tweezers. More DoFs for manipulating an object can access more maneuvers and radically increase maneuvering precision, which is of significance in biology and related microscopic detection. However, manipulating particles beyond three-dimensional (3D) spatial manipulation by using current all-optical tweezers technology remains difficult. To overcome this limitation, we theoretically and experimentally present six-dimensional (6D) structured optical tweezers based on tailoring structured light emulating rigid-body mechanics. Our method facilitates the evaluation of the methodology of rigid-body mechanics to synthesize six independent DoFs in a structured optical trapping system, akin to six-axis rigid-body manipulation, including surge, sway, heave, roll, pitch, and yaw. In contrast to previous 3D optical tweezers, our 6D structured optical tweezers significantly improved the flexibility of the path design of complex trajectories, thereby laying the foundation for next-generation functional optical manipulation, assembly, and micromechanics.
2023, 11(9): 1524
为研究高阶衍射级光束的轨道角动量, 基于计算全息法在空间光调制器的傅里叶平面产生了不同衍射级的完美涡旋光束, 并利用球面波干涉法对其拓扑荷值进行了测量。理论和实验结果表明不同衍射级 p 上的整数阶和分数阶完美涡旋光束的拓扑荷值 l 都满足 l=mp 的关系, 其中 m 是相位掩模板的拓扑荷值。并进一步对不同衍射级的光学涡旋阵列进行了实验研究, 结果表明光学涡旋阵列中光学涡旋的拓扑荷值满足 l=p 的关系, 高阶衍射级上的衍射光束比 +1 级衍射光束具有更大的轨道角动量。该研究为光学涡旋及光学涡旋阵列进一步的研究及应用提供了理论和实验参考。傅里叶光学 轨道角动量 计算全息 完美涡旋光束 光学涡旋阵列 Fourier optics orbital angular momentum computer generated holography perfect vortex beam optical vortex array
2021, 41(21): 2126001
2021, 50(9): 20210380