13 July 2004 Nanoscale optical imaging technique
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The optical resolution limits the observation of fine features with size below diffraction limit, e.g. 500nm. We propose and demonstrate a technique that uses collimated laser scattering to characterize such features. We use a new illumination technique that let us image bio-molecules down to 50nm with optical microscopy. We observed vesicles with size down to 50nm and visualize the flow of such tiny molecules in the live cells. We could also characterize the detailed size and molecular weight of such particles.
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Sheng Wu, Yongchun Tang, "Nanoscale optical imaging technique", Proc. SPIE 5324, Three-Dimensional and Multidimensional Microscopy: Image Acquisition and Processing XI, (13 July 2004); doi: 10.1117/12.553705; https://doi.org/10.1117/12.553705

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