Localization-driven Nanoscale Imaging era
Stefan Hell's 1994 STED work demonstrated that optical resolution could be pushed below the diffraction limit through controlled depletion, establishing a nanoscale imaging framework that influenced localization-based approaches. W. E. Moerner pioneered first single-molecule fluorescence detection and tracking in biological systems, enabling nanometer-precision localization and quantitative analyses of molecular motion in membranes and cells. Xiaowei Zhuang and colleagues advanced localization-based, multiplexed imaging by using spectrally distinct, photostable probes to localize many fluorophores with nanometer precision and to perform dynamic single-molecule tracking in living cells. Eric Betzig contributed early near-field imaging approaches that demonstrated nanoscale optical localization, and Roger Y. Tsien provided the bright, photostable dyes and multiplex labeling strategies that underpinned in vivo bioimaging in this era.