Journal: Nature Communications

Article Title: Stable ultrafast graphene hot-electron source on optical fiber

doi: 10.1038/s41467-025-60915-x

Figure Lengend Snippet: a Schematic diagram of our ultrafast SEM. A traditional scanning microscope body is equipped with our optical fiber-integrated graphene ultrafast hot-electron source for spatial and temporal imaging. CL: Cathodoluminescence; TCSPC: Time-correlated single-photon counting; APD: Avalanche photodiode. b Images obtained from the ultrafast electron microscope using a secondary electron detector. High signal-to-background ratio images can be captured when the laser is turned on, benefiting from the pure pulsed electrons from graphene. c CL and far-field PL spectra of CdSe/ZnS quantum dots. d Time-resolved CL and PL spectra (circles) of CdSe/ZnS quantum dots. The exponential decay fitting (solid lines) gives decay lifetimes of CL ( \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${{\tau }}_{{{{{\rm{CL}}}}}}$$\end{document} τ CL ) and PL ( \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${{\tau }}_{{{{{\rm{PL}}}}}}$$\end{document} τ PL ) of 2.5 ns and 2.6 ns, respectively. The optical excitation at 1560 nm is transmitted via optical fiber.

Article Snippet: Fig. 4 Ultrafast scanning electron microscope (SEM) based on the optical fiber-integrated graphene ultrafast hot-electron source. a Schematic diagram of our ultrafast SEM.

Techniques: Microscopy, Imaging