Journal
OPTICS EXPRESS
Volume 18, Issue 25, Pages 26417-26429Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.18.026417
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Stimulated emission depletion (STED) resolves fluorescent features that are closer than the far-field optical diffraction limit by applying a spatially modulated light field keeping all but one of these features dark consecutively. For estimating the efficiency of transient fluorophore darkening, we developed analytical equations considering the spatio-temporal intensity profile of the STED beam. These equations provide a quick analysis and optimization of the resolution and contrast to be gained under various conditions, such as continuous wave or pulsed STED beams having different pulse durations. Particular emphasis is placed on fluorescence fluctuation methods such as correlation spectroscopy (FCS) using STED. (C)2010 Optical Society of America
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