利用低成本衍射光学元件实现稳健的轨道角动量传递
Robust Orbital Angular Momentum Transfer Using Low-Cost Diffractive Optics
浏览论文内容
中文总结 AI 辅助
该研究利用印刷在醋酸基底上的低成本静态二元全息图，实现了光镊中稳健的轨道角动量传递，构建了适用于多领域的结构化光操控平台。
中文摘要 AI 辅助
轨道角动量（OAM）向微观物体的可靠传递通常依赖于由可编程空间光调制器或精密制备的相位光学元件产生的高保真涡旋光束。本文中，我们证明光镊中的稳健OAM传递可通过使用印刷在醋酸基底上的静态二元全息图实现。印刷的衍射光学元件产生具有足够空间保真度的拉盖尔-高斯涡旋光束，以在高数值孔径光镊系统中诱导聚苯乙烯微球的受控光学力矩和稳定旋转操控。尽管衍射效率仅约为2%，但产生的光束在第一衍射级使用小于1 mW的光功率即可实现可重复的粒子旋转。我们系统地表征了旋转动力学与入射光功率和拓扑电荷的函数关系，揭示了角速度随这两个参数的预期增加，这与过阻尼机制中OAM驱动的力矩一致。这些结果表明，高效的光学角动量传递对无源印刷衍射光学元件的低效率具有显著耐受性，建立了一种稳健、可扩展且高损伤阈值的结构化光光学操控平台，可应用于微流体、生物物理学、光机械学和光捕获领域。
英文摘要
Reliable transfer of orbital angular momentum (OAM) to microscopic objects typically relies on high-fidelity vortex beams generated by programmable spatial light modulators or precision-fabricated phase optics. Here, we demonstrate that robust OAM transfer in optical tweezers can be achieved using static binary holograms printed on acetate substrates. The printed diffractive optics generate Laguerre-Gaussian vortex beams with sufficient spatial fidelity to induce controlled optical torque and stable rotational manipulation of polystyrene microspheres in a high-numerical-aperture optical tweezers system. Despite a diffraction efficiency of only approximately 2%, the generated beams enable reproducible particle rotation using less than 1 mW of optical power in the first diffraction order. The rotational dynamics were systematically characterized as a function of incident optical power and topological charge, revealing the expected increase in angular velocity with both parameters, consistent with OAM-driven torque in the overdamped regime. These results demonstrate that efficient optical angular momentum transfer is remarkably tolerant to the reduced efficiency of passive printed diffractive optics, establishing a robust, scalable, and high-damage-threshold platform for structured-light optical manipulation with applications in microfluidics, biophysics, optomechanics, and optical trapping.
