Supercontinuum Stimulated Emission Depletion Fluorescence Lifetime Imaging
| Title | Supercontinuum Stimulated Emission Depletion Fluorescence Lifetime Imaging |
| Publication Type | Journal Article |
| Year of Publication | 2012 |
| Authors | Lesoine MD, Bose S, Petrich JW, Smith EA |
| Journal Title | Journal of Physical Chemistry B |
| Volume | 116 |
| Pages | 7821-7826 |
| Date Published | 07 |
| Type of Article | Article |
| ISBN Number | 1520-6106 |
| Accession Number | WOS:000306264200007 |
| Keywords | beams, 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 |
| DOI | 10.1021/jp303912p |
| Alternate Journal | J. Phys. Chem. B |
