title: Stimulated emission properties of fluorophores by CW-STED single molecule spectroscopy.
abstract: Fluorophores useful for STimulated Emission Depletion (STED) spectroscopy must fulfill strict requirements on depletion efficiency and photostability. These parameters determine the effective resolution of STED imaging. Resolution is typically measured on 30-80 nm spheres heavily decorated with STED bright fluorophores, limiting the possibility to estimate the true resolution achievable on a specific dye. Here we show how single molecule STED microscopy provides an estimate of the fluorophore stimulated emission cross section and of its photostability under STED irradiation. Fluorescein, a green and a yellow mutant of GFP, are tested, and the results are discussed and compared to those obtained with Chromeo488-covered 80 nm spheres on a commercial continuous-wave STED microscope.
authors.affiliation: Physics Department, Università degli Studi di Milano-Bicocca , Piazza della Scienza 3, 20126, Milano, Italy.
authors.forename: Margaux
authors.initials: M
authors.lastname: Bouzin
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Chirico
authors.forename: Laura
authors.initials: L
authors.lastname: D'Alfonso
authors.forename: Laura
authors.initials: L
authors.lastname: Sironi
authors.forename: Giancarlo
authors.initials: G
authors.lastname: Soavi
authors.forename: Giulio
authors.initials: G
authors.lastname: Cerullo
authors.forename: Barbara
authors.initials: B
authors.lastname: Campanini
authors.forename: Maddalena
authors.initials: M
authors.lastname: Collini