涡旋光束的轴向超局域化
Axial superlocalization with vortex beams
摘要：
提高轴向分辨率对于三维光学成像系统是至关重要的。在这里，我们调查的最终精度轴向定位使用涡旋光束。对于拉盖尔-高斯光束，仅用强度扫描就可以达到这个极限。对于拉盖尔-高斯光束的叠加，特别是对于具有在散焦时旋转的强度分布的那些，情况并非如此。因此，基于旋转涡旋光束的显微镜方法可以受益于用先进的模式分选技术取代传统的强度传感器。
英文摘要：
Improving axial resolution is of paramount importance for three-dimensional optical imaging systems. Here, we investigate the ultimate precision in axial localization using vortex beams. For Laguerre-Gauss beams, this limit can be achieved with just an intensity scan. The same is not true for superpositions of Laguerre-Gauss beams, in particular for those with intensity profiles that rotate on defocusing. Microscopy methods based on rotating vortex beams may thus benefit from replacing traditional intensity sensors with advanced mode-sorting techniques.
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