Supercontinuum Stimulated Emission Depletion Fluorescence Lifetime Imaging

TitleSupercontinuum Stimulated Emission Depletion Fluorescence Lifetime Imaging
Publication TypeJournal Article
Year of Publication2012
AuthorsLesoine MD, Bose S, Petrich JW, Smith EA
Journal TitleJournal of Physical Chemistry B
Volume116
Pages7821-7826
Date Published07
Type of ArticleArticle
ISBN Number1520-6106
Accession NumberWOS:000306264200007
Keywordsbeams, limit, resolution, sted microscopy
Abstract

Supercontinuum (SC) stimulated emission depletion (STED) fluorescence lifetime imaging is demonstrated by using time-correlated single-photon counting (TCSPC) detection. The spatial resolution of the developed STED instrument was measured by imaging monodispersed 40-nm fluorescent beads and then determining their fwhm, and was 36 +/- 9 and 40 +/- 10 nm in the X and Y coordinates, respectively. The same beads measured by confocal microscopy were 450 +/- 50 and 430 +/- 30 rim, which is larger than the diffraction limit of light due to underfilling the microscope objective. Underfilling the objective and time gating the signal were necessary to achieve the stated STED spatial resolution. The same fluorescence lifetime (2.0 +/- 0.1 ns) was measured for the fluorescent beads by using confocal or STED lifetime imaging The instrument has been applied to study Alexa Fluor 594-phalloidin labeled F-actin-rich projections with dimensions smaller than the diffraction limit of light in cultured cells. Fluorescence lifetimes of the actin-rich projections range from 2.2 to 2.9 ns as measured by STED lifetime imaging.

URL<Go to ISI>://WOS:000306264200007
DOI10.1021/jp303912p
Alternate JournalJ. Phys. Chem. B