Advances in Sub-20-nm Fluorescence Super-Resolution Microscopy(Invited)
Fluorescence super-resolution microscopy has undergone several rounds of innovation and development since the 1990s.The spatial resolution of fluorescence super-resolution microscopy exceeds the diffraction limit by a wide margin,achieving a lateral resolution below to~20 nm and enabling imaging and tracking at the molecular level.The latest generation of ultrahigh-resolution microscopy is the product of extensive development and innovative combination of conventional super-resolution techniques.This review aimed to introduce the new generation of fluorescence super-resolution microscopy at a sub-20-nm scale lateral resolution,and we also elucidated their similarities and differences compared with the conventional super-resolution techniques.Additionally,this review explored how emerging technologies optimize optical systems,scanning strategies,and sample preparation to improve resolution.Finally,we discussed the potential applications and development of high-resolution fluorescence microscopy in biomedical research.