Journal
OPTICS EXPRESS
Volume 16, Issue 6, Pages 4154-4162Publisher
Optica Publishing Group
DOI: 10.1364/OE.16.004154
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We undertake a comprehensive study of the inverse square root dependence of spatial resolution on the saturation factor in stimulated emission depletion (STED) microscopy and generalize it to account for various focal depletion patterns. We used an experimental platform featuring a high quality depletion pattern which results in operation close to the optimal optical performance. Its superior image brightness and uniform effective resolution <25 nm are evidenced by imaging both isolated and self-organized convectively assembled fluorescent beads. For relevant saturation values, the generalized square-root law is shown to predict the practical resolution with high accuracy. (C) 2008 Optical Society of America.
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