Bobkova Valeriia, Stegemann Jan, Droop Ramon, Otte Eileen, Denz Cornelia
Opt Express. 2021 Apr 26;29(9):12967-12975. doi: 10.1364/OE.419876.
We customize a transversely structured, tunable light landscape on the basis of orbital angular momentum (OAM)-carrying beams for the purpose of advanced optical manipulation. Combining Laguerre-Gaussian (LG) modes with helical phase fronts of opposite OAM handedness, counter-rotating transfer of OAM is enabled in a concentric intensity structure, creating a dynamic "grinding" scenario on dielectric microparticles. We demonstrate the ability to trap and rotate silica spheres of various sizes and exploit the light fields' feature to spatially separate trapped objects by their size. We show the adaptability of the light field depending on the chosen LG mode indices, allowing on-demand tuning of the trapping potential and sorting criteria. The versatility of our approach for biomedical application is examined by spatial discriminating yeast cells and silica spheres of distinct diameter.
我们基于携带轨道角动量（OAM）的光束定制了一种横向结构的、可调谐的光场，用于先进的光学操控。将拉盖尔 - 高斯（LG）模式与具有相反OAM手性的螺旋相位前沿相结合，在同心强度结构中实现了OAM的反向旋转传输，在介电微粒子上创造了一种动态的“研磨”场景。我们展示了捕获和旋转各种尺寸二氧化硅球体的能力，并利用光场的特性按尺寸对捕获的物体进行空间分离。我们展示了光场根据所选LG模式指数的适应性，允许按需调整捕获势和分选标准。通过对不同直径的酵母细胞和二氧化硅球体进行空间区分，检验了我们方法在生物医学应用中的多功能性。
