Using a pump–probe technique, scientists have experimentally demonstrated a nonlinear imaging scheme that permits the super-resolution imaging of nonfluorescent samples, making it promising for use with unstained specimens.
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The author holds a patent for nonlinear structured illumination.
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Heintzmann, R. Beyond the realm of fluorescence. Nature Photon 7, 426–428 (2013). https://doi.org/10.1038/nphoton.2013.117
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DOI: https://doi.org/10.1038/nphoton.2013.117