Nonlinear structured-illumination microscopy: Wide-field fluorescence imaging with theoretically unlimited resolution
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...Nonlinear structured illumination microscopy (10) has so far achieved resolution (full width at half-maximum (FWHM) of the point spread function (PSF)) of 50 nm and can in principle be improved further, but is limited by the photobleaching properties of the fluorophore, and uses excitation intensities near saturation, where photobleaching may be more pronounced than at low intensity (10)....
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...New imaging methods such as 4Pi microscopy (4–9), patterned illumination microscopy (10,11), stimulated emission depletion (STED) microscopy (12–14), and other types of reversible saturable optical fluorescence transition (RESOLFT) microscopies (15) can increase resolution by reducing the size of the observation volume or, correspondingly, by increasing the accessible Fourier space and therefore increasing the number of accessible spatial frequencies....
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...x 1⁄4 rmax rmin 1⁄4 k max A FA 1 k0 kBC k max x FB 1 kBC k0 ; (10)...
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